select  md5("?") =?, sleep(?), rand(?);
select * from my1 where md5("?") =?;
select  md5("?") =?;
select * from my1 where md5("?") =?;
select sleep(?);
select * from tst where lname='?';
select ?,?,?,?,?,? from tst;
select * from tst where fname like '?';
select * from tst where lname like '?' order by fname;
insert into tst values ("?","?"),("?",?),("?","?");
drop table if exists tst;
create table tst(fname varchar(30), lname varchar(30));
update tst set lname="?" where fname like '?' or lname like '?';
delete from tst where lname like '?' and fname like '?';
select ? from tst where fname='?' or lname like '?';
select ?,?,?,? from tst where name='?' or name='?' or name='?' or name='?';
select count(?),count(?),count(?),count(?),count (?),count(?) from tst;
select count(?),count(?),count(?),count(?),count (?),count(?) from tst;