Re: BUG #18774: Not the required output of the query used in the function(delete_from_table1) in postgresql9.4

You seem to have reversed which query you deem correct...

On Wed, Jan 22, 2025 at 8:59 AM Rajni Bobal <rajnibobal(at)gmail(dot)com> wrote:

>
> || quote_ident(colname)
> || ' IN (SELECT '
> || quote_ident(colname)
> || ' FROM '
> || quote_ident(sel_tblname)
>

This deletes rows from the table depending upon finding the same value in
colname in the subquery.

> ' where $1 in (select $1 from ' || quote_ident(sel_tblname) ||
>

This deletes rows from the table depending only upon finding at least one
row in the subquery - the limit is basically pointless. Since all rows
return the value provided in $1, and $1 = $1.

So these indeed produce different results, as they should. The "error" one
is behaving exactly as it should. If it doesn't do what you want - which
is likely as it is a very unusual query - don't use it.

David J.