504 lines
		
	
	
		
			20 KiB
		
	
	
	
		
			Plaintext
		
	
	
	
	
	
			
		
		
	
	
			504 lines
		
	
	
		
			20 KiB
		
	
	
	
		
			Plaintext
		
	
	
	
	
	
| drop database if exists view;
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| create database view;
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| use view;
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| set character_set_client = 45;
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| drop table if exists t1;
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| drop view if exists v, vv;
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| create table t1(c1 int, c2 int);
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| create view v as select c1, c2 from t1;
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| create view vv as select c1 from v;
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| select c1, c2 from v;
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| c1	c2
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| alter table t1 drop column c2;
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| select c1 from v;
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| ERROR 42S22: View 'view.v' references invalid table(s) or column(s) or function(s) or definer/invoker of view lack rights to use them
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| select c2 from v;
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| ERROR 42S22: View 'view.v' references invalid table(s) or column(s) or function(s) or definer/invoker of view lack rights to use them
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| select c1, c2 from v;
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| ERROR 42S22: View 'view.v' references invalid table(s) or column(s) or function(s) or definer/invoker of view lack rights to use them
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| drop table t1;
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| select c1 from v;
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| ERROR 42S22: View 'view.v' references invalid table(s) or column(s) or function(s) or definer/invoker of view lack rights to use them
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| select c2 from v;
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| ERROR 42S22: View 'view.v' references invalid table(s) or column(s) or function(s) or definer/invoker of view lack rights to use them
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| select c1, c2 from v;
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| ERROR 42S22: View 'view.v' references invalid table(s) or column(s) or function(s) or definer/invoker of view lack rights to use them
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| create table t1(c1 int);
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| select c1 from vv;
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| ERROR 42S22: View 'view.v' references invalid table(s) or column(s) or function(s) or definer/invoker of view lack rights to use them
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| select c2 from vv;
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| ERROR 42S22: View 'view.v' references invalid table(s) or column(s) or function(s) or definer/invoker of view lack rights to use them
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| select c1, c2 from vv;
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| ERROR 42S22: View 'view.v' references invalid table(s) or column(s) or function(s) or definer/invoker of view lack rights to use them
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| select 1 as a from vv;
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| ERROR 42S22: View 'view.v' references invalid table(s) or column(s) or function(s) or definer/invoker of view lack rights to use them
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| drop table if exists t1;
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| drop view if exists v, vv;
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| create table t1(c1 int, c2 int);
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| create view v as select c1, c2 from t1;
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| create view vv as select c2 from v;
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| select c1, c2 from v;
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| c1	c2
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| alter table t1 drop column c2;
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| select c1 from v;
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| ERROR 42S22: View 'view.v' references invalid table(s) or column(s) or function(s) or definer/invoker of view lack rights to use them
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| select c2 from v;
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| ERROR 42S22: View 'view.v' references invalid table(s) or column(s) or function(s) or definer/invoker of view lack rights to use them
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| select c1, c2 from v;
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| ERROR 42S22: View 'view.v' references invalid table(s) or column(s) or function(s) or definer/invoker of view lack rights to use them
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| drop table t1;
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| select c1 from v;
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| ERROR 42S22: View 'view.v' references invalid table(s) or column(s) or function(s) or definer/invoker of view lack rights to use them
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| select c2 from v;
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| ERROR 42S22: View 'view.v' references invalid table(s) or column(s) or function(s) or definer/invoker of view lack rights to use them
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| select c1, c2 from v;
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| ERROR 42S22: View 'view.v' references invalid table(s) or column(s) or function(s) or definer/invoker of view lack rights to use them
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| create table t1(c1 int);
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| select c1 from vv;
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| ERROR 42S22: View 'view.v' references invalid table(s) or column(s) or function(s) or definer/invoker of view lack rights to use them
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| select c2 from vv;
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| ERROR 42S22: View 'view.v' references invalid table(s) or column(s) or function(s) or definer/invoker of view lack rights to use them
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| select c1, c2 from vv;
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| ERROR 42S22: View 'view.v' references invalid table(s) or column(s) or function(s) or definer/invoker of view lack rights to use them
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| select c2, c1 from vv;
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| ERROR 42S22: View 'view.v' references invalid table(s) or column(s) or function(s) or definer/invoker of view lack rights to use them
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| select 1 as a from vv;
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| ERROR 42S22: View 'view.v' references invalid table(s) or column(s) or function(s) or definer/invoker of view lack rights to use them
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| drop table if exists t1,t2;
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| drop view if exists v,vv;
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| create table t1(c1 int ,c2 int);
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| create table t2(c1 int ,c2 int);
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| create view v as select c1, c2 from t1;
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| create view vv as select c1 from v;
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| alter table t1 drop column c2;
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| select * from v;
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| ERROR 42S22: View 'view.v' references invalid table(s) or column(s) or function(s) or definer/invoker of view lack rights to use them
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| select v.* from v;
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| ERROR 42S22: View 'view.v' references invalid table(s) or column(s) or function(s) or definer/invoker of view lack rights to use them
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| select * from vv;
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| ERROR 42S22: View 'view.v' references invalid table(s) or column(s) or function(s) or definer/invoker of view lack rights to use them
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| select vv.* from vv;
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| ERROR 42S22: View 'view.v' references invalid table(s) or column(s) or function(s) or definer/invoker of view lack rights to use them
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| drop table if exists t1,t2;
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| drop view if exists v;
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| create table t1(c1 int,c2 int);
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| create table t2(c1 int,c2 int);
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| create view v as select c1, c2 from t1;
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| alter table t1 drop column c2;
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| select v.c1 from v join t2 on v.c1 = t2.c1;
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| ERROR 42S22: View 'view.v' references invalid table(s) or column(s) or function(s) or definer/invoker of view lack rights to use them
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| select v.c1 from v join t2 on v.c2 = t2.c2;
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| ERROR 42S22: View 'view.v' references invalid table(s) or column(s) or function(s) or definer/invoker of view lack rights to use them
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| select v.c1 from v join t2 using(c1);
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| ERROR 42S22: View 'view.v' references invalid table(s) or column(s) or function(s) or definer/invoker of view lack rights to use them
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| select v.c1 from v join t2 using(c2);
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| ERROR 42S22: View 'view.v' references invalid table(s) or column(s) or function(s) or definer/invoker of view lack rights to use them
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| drop table if exists t1,t2;
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| drop view if exists v;
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| create table t1(c1 int,c2 int);
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| create view v as select c1, c2 from t1;
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| select c1 from v where c2 = 1;
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| c1
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| select c1 from v where (select c2) = 1;
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| c1
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| alter table t1 drop column c2;
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| select c1 from v where c2 = 1;
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| ERROR 42S22: View 'view.v' references invalid table(s) or column(s) or function(s) or definer/invoker of view lack rights to use them
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| select c1 from v where (select c2) = 1;
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| ERROR 42S22: View 'view.v' references invalid table(s) or column(s) or function(s) or definer/invoker of view lack rights to use them
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| drop table if exists t1,t2;
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| drop view if exists v;
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| create table t1(c1 int,c2 int);
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| create view v as select c1, c2 from t1;
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| select c1 from v order by c2;
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| c1
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| select c1 from v order by (select c2);
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| c1
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| alter table t1 drop column c2;
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| select c1 from v order by c2;
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| ERROR 42S22: View 'view.v' references invalid table(s) or column(s) or function(s) or definer/invoker of view lack rights to use them
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| select c1 from v order by (select c2);
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| ERROR 42S22: View 'view.v' references invalid table(s) or column(s) or function(s) or definer/invoker of view lack rights to use them
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| drop table if exists t1,t2;
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| drop view if exists v;
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| create table t1(c1 int,c2 int);
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| create view v as select c1, c2 from t1;
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| select c1 from v group by c2;
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| c1
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| select c1 from v group by (select c2);
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| c1
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| alter table t1 drop column c2;
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| select c1 from v group by c2;
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| ERROR 42S22: View 'view.v' references invalid table(s) or column(s) or function(s) or definer/invoker of view lack rights to use them
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| select c1 from v group by (select c2);
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| ERROR 42S22: View 'view.v' references invalid table(s) or column(s) or function(s) or definer/invoker of view lack rights to use them
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| drop table if exists t1;
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| drop view if exists v;
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| create table t1(c1 int,c2 int);
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| insert into t1 values(1,2),(2,3),(3,4);
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| create view v as select c1,c2 from t1 order by c2;
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| alter table t1 drop column c2;
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| select c1 from v;
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| ERROR 42S22: View 'view.v' references invalid table(s) or column(s) or function(s) or definer/invoker of view lack rights to use them
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| drop table if exists t1;
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| drop view if exists v;
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| create table t1(c1 int,c2 int);
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| insert into t1 values(1,2),(2,3),(3,4);
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| create view v as select c1, -1 as c2 from t1 order by (select c2);
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| select c1 from v;
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| c1
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| 1
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| 2
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| 3
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| alter table t1 drop column c2;
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| select c1 from v;
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| ERROR 42S22: View 'view.v' references invalid table(s) or column(s) or function(s) or definer/invoker of view lack rights to use them
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| drop table if exists t1;
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| drop view if exists v;
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| create table t1(c1 int,c2 int);
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| create view v as select c1,c2 from t1 where c2=1;
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| alter table t1 drop column c2;
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| select c1 from v;
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| ERROR 42S22: View 'view.v' references invalid table(s) or column(s) or function(s) or definer/invoker of view lack rights to use them
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| drop table if exists t1;
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| drop view if exists v;
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| create table t1(c1 int,c2 int);
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| insert into t1 values(1,2),(2,3),(3,4);
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| create view v as select c1, -1 as c2 from t1 order by (select c2);
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| alter table t1 drop column c2;
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| select c1 from v;
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| ERROR 42S22: View 'view.v' references invalid table(s) or column(s) or function(s) or definer/invoker of view lack rights to use them
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| drop table if exists t1;
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| drop view if exists v;
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| create table t1(c1 int,c2 int);
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| create view v as select c1,sum(c2) from t1;
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| alter table t1 drop column c2;
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| select c1 from v;
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| ERROR 42S22: View 'view.v' references invalid table(s) or column(s) or function(s) or definer/invoker of view lack rights to use them
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| drop table if exists t1;
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| drop view if exists v;
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| create table t1(c1 int,c2 int);
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| insert into t1 values(1,2),(2,3),(3,4),(4,5);
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| create view v as select c1,c2 from t1;
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| select * from v;
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| c1	c2
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| 1	2
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| 2	3
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| 3	4
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| 4	5
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| alter table t1 drop column c2;
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| select c1 from v;
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| ERROR 42S22: View 'view.v' references invalid table(s) or column(s) or function(s) or definer/invoker of view lack rights to use them
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| select c2 from v;
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| ERROR 42S22: View 'view.v' references invalid table(s) or column(s) or function(s) or definer/invoker of view lack rights to use them
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| select * from v;
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| ERROR 42S22: View 'view.v' references invalid table(s) or column(s) or function(s) or definer/invoker of view lack rights to use them
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| alter table t1 add column c2 int default 100;
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| select * from v;
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| c1	c2
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| 1	100
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| 2	100
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| 3	100
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| 4	100
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| alter table t1 alter column c2 set default 200;
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| insert into t1(c1) values(5);
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| select * from v;
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| c1	c2
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| 1	100
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| 2	100
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| 3	100
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| 4	100
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| 5	200
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| drop table if exists t1;
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| drop view if exists v;
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| create table t1(c1 int);
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| create view v as select c1 from t1;
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| desc v;
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| Field	Type	Null	Key	Default	Extra
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| c1	int(11)	YES		NULL	
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| drop table if exists t1,t2;
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| drop view if exists v;
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| create table t1(c1 int);
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| create table t2(c1 int);
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| create view v as (select c1 from t1) union (select c1 from t2);
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| desc v;
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| Field	Type	Null	Key	Default	Extra
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| c1	int(11)	YES		NULL	
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| drop table if exists t1;
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| drop view if exists v;
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| create table t1(c1 int,c2 int);
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| create view v as select c1,c2 from t1;
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| desc v;
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| Field	Type	Null	Key	Default	Extra
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| c1	int(11)	YES		NULL	
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| c2	int(11)	YES		NULL	
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| alter table t1 drop column c2;
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| desc v;
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| ERROR 42S22: View 'view.v' references invalid table(s) or column(s) or function(s) or definer/invoker of view lack rights to use them
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| drop table if exists t1;
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| drop view if exists v,vv;
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| create table t1(c1 int,c2 int);
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| create view v as select c1,c2 from t1;
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| create view vv as select c1,c2 from v;
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| alter table t1 drop column c2;
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| desc v;
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| ERROR 42S22: View 'view.v' references invalid table(s) or column(s) or function(s) or definer/invoker of view lack rights to use them
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| desc vv;
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| ERROR 42S22: View 'view.vv' references invalid table(s) or column(s) or function(s) or definer/invoker of view lack rights to use them
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| drop table if exists t1;
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| drop view if exists v,vv;
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| create table t1(c1 int,c2 int);
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| create view v as select c1,c2 from t1;
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| create view vv as select c1,c2 from v;
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| create or replace view v as select c1 from t1;
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| desc v;
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| Field	Type	Null	Key	Default	Extra
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| c1	int(11)	YES		NULL	
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| desc vv;
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| ERROR 42S22: View 'view.vv' references invalid table(s) or column(s) or function(s) or definer/invoker of view lack rights to use them
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| create or replace view vv as select c1 from v;
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| desc vv;
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| Field	Type	Null	Key	Default	Extra
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| c1	int(11)	NO			
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| drop table if exists t1,t2,t3,t4;
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| drop view if exists v,vv;
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| create table t1(c1 int,c2 int);
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| create table t2(c1 int,c2 int);
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| create table t3(c1 int,c2 int);
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| create table t4(c1 int,c2 int);
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| create view v as ((select * from t1) union (select c1,c2 from t2)) union (select * from t3);
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| desc v;
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| Field	Type	Null	Key	Default	Extra
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| c1	int(11)	YES		NULL	
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| c2	int(11)	YES		NULL	
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| create view vv as (select * from v) union (select * from t4);
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| desc vv;
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| Field	Type	Null	Key	Default	Extra
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| c1	int(11)	NO			
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| c2	int(11)	NO			
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| drop table if exists t1,t2;
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| drop view if exists v;
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| create table t1(c1 int,c2 int);
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| create table t2(c1 int,c2 int);
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| create view v as select c1,c2 from t1;
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| select (select c2 from v limit 1) from t2;
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| (select c2 from v limit 1)
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| alter table t1 drop column c2;
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| select (select c2 from v limit 1) from t2;
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| ERROR 42S22: View 'view.v' references invalid table(s) or column(s) or function(s) or definer/invoker of view lack rights to use them
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| select (select c3 from v limit 1) from t2;
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| ERROR 42S22: View 'view.v' references invalid table(s) or column(s) or function(s) or definer/invoker of view lack rights to use them
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| alter table t2 add column c3 int;
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| select (select c3 from v limit 1) from t2;
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| ERROR 42S22: View 'view.v' references invalid table(s) or column(s) or function(s) or definer/invoker of view lack rights to use them
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| drop table if exists t1;
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| drop view if exists t1;
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| drop table if exists v1,v2,v3;
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| drop view if exists v1,v2,v3;
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| create table t1(c1 int);
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| create view v1 as select * from t1;
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| create view v2 as select * from v1;
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| create view v3 as select * from v2;
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| drop table t1;
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| rename table v3 to t1;
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| select * from v1;
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| ERROR 42S02: 'view.v1' contains view recursion
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| select * from v2;
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| ERROR 42S02: 'view.v2' contains view recursion
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| select * from v3;
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| ERROR 42S02: Table 'view.v3' doesn't exist
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| drop table if exists t1,t2;
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| drop view if exists t1,t2;
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| drop table if exists v1,v2,v3;
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| drop view if exists v1,v2,v3;
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| create table t1(c1 int);
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| create table t2(c1 int);
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| create view v1 as select * from t1;
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| create view v2 as select * from t2;
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| create view v3 as select v1.c1 as v1c1, v2.c1 as v2c1 from v1,v2;
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| drop table t2;
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| rename table v3 to t2;
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| select * from t2;
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| ERROR 42S02: 'view.t2' contains view recursion
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| select * from v2;
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| ERROR 42S02: 'view.v2' contains view recursion
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| drop table if exists t1,t2;
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| drop view if exists t1,t2;
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| drop table if exists v1,v2;
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| drop view if exists v1,v2;
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| create table t1(c1 int);
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| create table t2(c1 int);
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| create view v1 as select * from t1;
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| create view v2 as select (select c1 from v1 limit 1) from t2;
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| drop table t1;
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| rename table v2 to t1;
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| select * from t1;
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| ERROR 42S02: 'view.t1' contains view recursion
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| select * from v1;
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| ERROR 42S02: 'view.v1' contains view recursion
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| drop table if exists t1;
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| drop view if exists t1;
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| drop table if exists v1,v2,v3,v4;
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| drop view if exists v1,v2,v3,v4;
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| create table t1(c1 int);
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| create view v1 as select * from t1;
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| create view v2 as select * from v1;
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| create view v3 as select * from v2;
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| create view v4 as select * from v2;
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| drop view v1;
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| rename table v4 to v1;
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| select * from v1;
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| ERROR 42S02: 'view.v1' contains view recursion
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| select * from v2;
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| ERROR 42S02: 'view.v2' contains view recursion
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| select * from v3;
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| ERROR 42S02: 'view.v2' contains view recursion
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| SET optimizer_switch = (SELECT variable_value FROM INFORMATION_SCHEMA.GLOBAL_VARIABLES WHERE VARIABLE_NAME = 'optimizer_switch');
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| ERROR 0A000: subqueries or stored function calls here not supported
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| drop table if exists t1,t2;
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| drop view if exists v1;
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| create table t1(c1 int,c2 int);
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| create table t2(c1 int,c2 int);
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| insert into t1(c1,c2) values(1,2),(2,3);
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| create view v1 as select * from t1;
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| insert into t2(c1,c2) select * from v1;
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| select * from t2;
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| c1	c2
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| 1	2
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| 2	3
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| drop table if exists t1;
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| drop view if exists v;
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| create table t1(c1 int,c2 int);
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| create view v as select * from t1;
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| alter table t1 drop column c2;
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| select c1 from v;
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| ERROR 42S22: View 'view.v' references invalid table(s) or column(s) or function(s) or definer/invoker of view lack rights to use them
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| show warnings;
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| Level	Code	Message
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| Error	1356	View 'view.v' references invalid table(s) or column(s) or function(s) or definer/invoker of view lack rights to use them
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| drop table if exists t1;
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| drop view if exists v;
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| create table t1(c1 int,c2 int);
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| create view v as select * from t1;
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| alter table t1 drop column c2;
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| select c1 from v;
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| ERROR 42S22: View 'view.v' references invalid table(s) or column(s) or function(s) or definer/invoker of view lack rights to use them
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| show warnings;
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| Level	Code	Message
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| Error	1356	View 'view.v' references invalid table(s) or column(s) or function(s) or definer/invoker of view lack rights to use them
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| drop table if exists t1;
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| drop view if exists v;
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| create table t1(c1 int,c2 int);
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| insert into t1 values(1, 1);
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| create view v as select * from t1 where not exists(select * from t1 where c1>0);
 | |
| show create view v;
 | |
| View	Create View	character_set_client	collation_connection
 | |
| v	CREATE VIEW `v` AS select `view`.`t1`.`c1` AS `c1`,`view`.`t1`.`c2` AS `c2` from `view`.`t1` where not exists((select `t1`.`c1`,`t1`.`c2` from `view`.`t1` `t1` where (`t1`.`c1` > 0)))	utf8mb4	utf8mb4_general_ci
 | |
| select * from v;
 | |
| c1	c2
 | |
| create view xy as select 123 from dual where not exists (select 1 from dual) limit 1;
 | |
| select * from xy;
 | |
| 123
 | |
| drop table if exists t1;
 | |
| drop table if exists t2;
 | |
| drop view if exists v;
 | |
| create table t1 (k int primary key, v1 int, v2 int);
 | |
| create table t2 (k int primary key, v1 char(1), v2 varchar(10));
 | |
| create view v as select k, v1, v2 from t1 union select k, v1, v2 from t2;
 | |
| show create view v;
 | |
| View	Create View	character_set_client	collation_connection
 | |
| v	CREATE VIEW `v` AS (select `view`.`t1`.`k` AS `k`,`view`.`t1`.`v1` AS `v1`,`view`.`t1`.`v2` AS `v2` from `view`.`t1`) union (select `view`.`t2`.`k` AS `k`,`view`.`t2`.`v1` AS `v1`,`view`.`t2`.`v2` AS `v2` from `view`.`t2`)	utf8mb4	utf8mb4_general_ci
 | |
| select * from v;
 | |
| k	v1	v2
 | |
| drop table if exists t1;
 | |
| drop view if exists v;
 | |
| create table t1 (k int, v int);
 | |
| create view v as (select k, v from t1) union (select 1, 1 from t1);
 | |
| show create view v;
 | |
| View	Create View	character_set_client	collation_connection
 | |
| v	CREATE VIEW `v` AS (select `view`.`t1`.`k` AS `k`,`view`.`t1`.`v` AS `v` from `view`.`t1`) union (select 1 AS `1`,1 AS `1` from `view`.`t1` `t1`)	utf8mb4	utf8mb4_general_ci
 | |
| drop table if exists t1;
 | |
| drop table if exists t2;
 | |
| CREATE TABLE `t11` ( `a` int(11) NOT NULL, `b` int(11) DEFAULT NULL, `c` int(11) DEFAULT NULL, PRIMARY KEY (`a`) );
 | |
| CREATE TABLE `t21` ( `a` int(11) NOT NULL, `b` int(11) DEFAULT NULL, `c` int(11) DEFAULT NULL, PRIMARY KEY (`a`) );
 | |
| explain extended_noaddr select t3.* from (select t11.a as X, t21.a as Y from t11 left join t21 on t11.a = t21.a) as t3 where t3.y is not null and t3.x > 10;
 | |
| Query Plan
 | |
| ==================================================
 | |
| |ID|OPERATOR          |NAME|EST.ROWS|EST.TIME(us)|
 | |
| --------------------------------------------------
 | |
| |0 |MERGE JOIN        |    |1       |5           |
 | |
| |1 |├─TABLE RANGE SCAN|t11 |1       |3           |
 | |
| |2 |└─TABLE RANGE SCAN|t21 |1       |3           |
 | |
| ==================================================
 | |
| Outputs & filters:
 | |
| -------------------------------------
 | |
|   0 - output([t11.a], [t21.a]), filter(nil), rowset=16
 | |
|       equal_conds([t11.a = t21.a]), other_conds(nil)
 | |
|       merge_directions([ASC])
 | |
|   1 - output([t11.a]), filter(nil), rowset=16
 | |
|       access([t11.a]), partitions(p0)
 | |
|       is_index_back=false, is_global_index=false, 
 | |
|       range_key([t11.a]), range(10 ; MAX), 
 | |
|       range_cond([t11.a > 10])
 | |
|   2 - output([t21.a]), filter(nil), rowset=16
 | |
|       access([t21.a]), partitions(p0)
 | |
|       is_index_back=false, is_global_index=false, 
 | |
|       range_key([t21.a]), range(10 ; MAX), 
 | |
|       range_cond([t21.a > 10])
 | |
| Used Hint:
 | |
| -------------------------------------
 | |
|   /*+
 | |
|       
 | |
|   */
 | |
| Qb name trace:
 | |
| -------------------------------------
 | |
|   stmt_id:0, stmt_type:T_EXPLAIN 
 | |
|   stmt_id:1, SEL$1 > SEL$CFEA49FE > SEL$A7A036C9 > SEL$AC33F27C > SEL$21AFC505
 | |
|   stmt_id:2, SEL$2
 | |
| Outline Data: 
 | |
| -------------------------------------
 | |
|   /*+
 | |
|       BEGIN_OUTLINE_DATA
 | |
|       LEADING(@"SEL$21AFC505" ("view"."t11"@"SEL$2" "view"."t21"@"SEL$2"))
 | |
|       USE_MERGE(@"SEL$21AFC505" "view"."t21"@"SEL$2")
 | |
|       FULL(@"SEL$21AFC505" "view"."t11"@"SEL$2")
 | |
|       FULL(@"SEL$21AFC505" "view"."t21"@"SEL$2")
 | |
|       MERGE(@"SEL$2" > "SEL$1")
 | |
|       OUTER_TO_INNER(@"SEL$CFEA49FE")
 | |
|       PRED_DEDUCE(@"SEL$A7A036C9")
 | |
|       SIMPLIFY_EXPR(@"SEL$AC33F27C")
 | |
|       OPTIMIZER_FEATURES_ENABLE('4.0.0.0')
 | |
|       END_OUTLINE_DATA
 | |
|   */
 | |
| Optimization Info:
 | |
| -------------------------------------
 | |
|   t11:
 | |
|       table_rows:1
 | |
|       physical_range_rows:1
 | |
|       logical_range_rows:1
 | |
|       index_back_rows:0
 | |
|       output_rows:1
 | |
|       table_dop:1
 | |
|       dop_method:Table DOP
 | |
|       avaiable_index_name:[t11]
 | |
|       stats version:0
 | |
|       dynamic sampling level:1
 | |
|   t21:
 | |
|       table_rows:1
 | |
|       physical_range_rows:1
 | |
|       logical_range_rows:1
 | |
|       index_back_rows:0
 | |
|       output_rows:1
 | |
|       table_dop:1
 | |
|       dop_method:Table DOP
 | |
|       avaiable_index_name:[t21]
 | |
|       stats version:0
 | |
|       dynamic sampling level:1
 | |
|   Plan Type:
 | |
|       LOCAL
 | |
|   Note:
 | |
|       Degree of Parallelisim is 1 because of table property
 | |
|   Expr Constraints:
 | |
|       1 result is TRUE
 | |
| drop database if exists view;
 | 
