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select * from tableA where a=1
select * from tableA where a=5
select * from tableA left join TableB on ....
Left join (select ... from TableC) on....
...
.
where a=1
select * from tableA left join TableB on ....
Left join (select ... from TableC) on....
...
.
where a=5
select * from tableA left join TableB on ....
Left join (select ... from TableC) on....
...
.
where a=?