Chuck Martin <clmartin@xxxxxxxxxxxxxxxx> writes: > I hope someone here can see something that eludes me. I've recently moved a > database from PostgreSQL 9.6 to 11, and there are a few oddities. The > following select statement returns zero rows when it should return one. > This is one of a small number of records that exist, but are not returned > by the query. When I include the main table, event, and any one of the > associated tables, the record is returned, but no record is returned with > the entire statement. All the primary keys (_pkey) and foreign keys (_fkey) > are integers. The field I suspect as the possible culprit, event.InsBy, is > a character column I'm converting to do a lookup on a primary key > (integer): event.InsBy::int = usr.Usr_pkey. Maybe PG 11 doesn't recognize > the same syntax for cast as PG 9.6? Or maybe I'm overlooking something else > basic. Thanks for reading! Maybe you've found a bug. Can you extract a self-contained case exhibiting this behavior? Is this 11.0 or 11.1? regards, tom lane