38 lines
1.7 KiB
Plaintext
38 lines
1.7 KiB
Plaintext
--disable_query_log
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set @@session.explicit_defaults_for_timestamp=off;
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--enable_query_log
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# owner: bin.lb
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# owner group: SQL1
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# tags: join
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# description:
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# join using case
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#
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--disable_warnings
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drop table if exists tjuo1,tjuo2,tjuo3;
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--enable_warnings
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create table tjuo1 (pk int,c1 int, primary key(pk));
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create table tjuo2 (pk int,c1 int, c2 int, primary key(pk));
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create table tjuo3 (pk int,c2 int, primary key(pk));
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insert into tjuo1 values(1, 11), (2, 12), (3, 13);
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insert into tjuo2 values(4, 11, 21), (5, 12, 22), (6, 13, 23);
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insert into tjuo3 values(7, 21), (8, 22), (9, 23);
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select * from tjuo1;
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select * from tjuo2;
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select * from tjuo3;
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#2T
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SELECT * FROM tjuo1 JOIN (SELECT * FROM tjuo2) as tjuo2_alias on tjuo1.c1= tjuo2_alias.c1;
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SELECT * FROM tjuo1 RIGHT JOIN (SELECT * FROM tjuo2) as tjuo2_alias USING (c1);
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#3T
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SELECT * FROM tjuo1 JOIN tjuo2 on tjuo1.c1=tjuo2.c1 JOIN tjuo3 on tjuo2.c2=tjuo3.c2;
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SELECT * FROM tjuo1 RIGHT JOIN tjuo2 USING (c1) RIGHT JOIN tjuo3 USING (c2);
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SELECT * FROM tjuo1 RIGHT JOIN (SELECT * FROM tjuo2) as tjuo2_alias USING (c1) RIGHT JOIN tjuo3 USING (c2);
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SELECT * FROM (SELECT * FROM tjuo1) tjuo1_alias RIGHT JOIN (SELECT * FROM tjuo2) as tjuo2_alias USING (c1) RIGHT JOIN (SELECT * FROM tjuo3) as tjuo3_alias USING (c2);
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SELECT * FROM (SELECT * FROM tjuo1) tjuo1_alias RIGHT JOIN tjuo2 USING (c1) RIGHT JOIN (SELECT * FROM tjuo3) as tjuo3_alias USING (c2);
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SELECT * FROM (SELECT c2 FROM tjuo1 as i1 JOIN (SELECT * FROM tjuo2) as i2 USING (c1) ) as t12 RIGHT JOIN (SELECT * FROM tjuo3) as tjuo3_alias USING (c2);
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SELECT * FROM (SELECT c2 FROM tjuo1 as i1 JOIN (SELECT * FROM tjuo2) as i2 USING (c1) ) as t12;
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drop table tjuo1, tjuo2, tjuo3;
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