ERROR: aggregates not allowed in WHERE clause STATEMENT: SELECT * FROM loans l WHERE id IN ( SELECT max(l.id) FROM loans JOIN customers c ON c.id = l.customer_id JOIN people p ON p.id = c.person_id WHERE p.first_name = 'Test person' GROUP BY l.loan_type_cd ) ;
The real issue is this:
ERROR: missing FROM-clause entry for table "l" at character 132 STATEMENT: SELECT max(l.id) FROM loans JOIN customers c ON c.id = l.customer_id JOIN people p ON p.id = c.person_id WHERE p.first_name = 'Test person' GROUP BY l.loan_type_cd;
And if I change the FROM loans to be FROM loans l, the original select does work fine.
Let me know if I need to create a full test case for this...
No, the real issue is that you are referencing the outer table's column's max() in the inner query (correlated sub-query). The table in the outer query is aliased 'l' and the sub-query is trying to aggregate that, which is in the outer query's WHERE clause; and that is not allowed.
Renaming the outer query's alias to something other than 'l' would show you the real error (which again would be 'missing FROM-clause entry).