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Re: [BUGS] BUG #14514: Bug in Subquery - Mailing list pgsql-bugs

From Pantelis Theodosiou
Subject Re: [BUGS] BUG #14514: Bug in Subquery
Date
Msg-id CAE3TBxyr-TZXGKUL1aBHbcKszA=-iaGe64NT2QCXWwR-mR+rPg@mail.gmail.com
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In response to Re: [BUGS] BUG #14514: Bug in Subquery  (Tom Lane <tgl@sss.pgh.pa.us>)
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On Wed, Jan 25, 2017 at 3:29 PM, Tom Lane <tgl@sss.pgh.pa.us> wrote:
reva.d91@gmail.com writes:
> It is ignoring the invalid columns in subquery,Instead of throwing the error
> 'Column does not exist'.

> (eg):
> select * from emp where (empname,empid,empno) in(selec emname,emid,emno from
> em_details)

> Note:There is no emno in em_details table.

Maybe not, but if there is one in emp, then this query is legal per
SQL spec --- emno is an outer reference.

                        regards, tom lane
 
What Tom says above, the query is legal SQL if the column exists in either table.

You should use aliases (or just prefix the columns with their table name and dot):

select e.* from emp as e
where (e.empname, e.empid, e.empno) in
    (select ed.emname, ed.emid, ed.emno
     from em_details as ed)

This way the query will work as you expected, either give a result (if the 3 columns exist in em_details) or give you an error if not.

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