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.
