thanks all!
On Apr 20, 2017, at 6:42 PM, David G. Johnston wrote:
Subqueries can see all columns of the parent. When the subquery actually uses one of them it is called a "correlated subquery".
i thought a correlated subquery had to note that table/alias, not a raw column. I guess i've just been adhering to good form.
On Apr 20, 2017, at 6:43 PM, Tom Lane wrote:
Cautious SQL programmers qualify all references inside sub-selects to avoid getting caught by this accidentally.
is there a syntax to qualify a reference to lock a subquery to the current scope (disable looking at the parents)? that's how I got caught on this by accident.