On Mon, Oct 28, 2019 at 3:45 PM Justin Pryzby <pry...@telsasoft.com> wrote:
> On Mon, Oct 28, 2019 at 03:40:58PM -0700, Craig James wrote: > > On Postgres 9.6 (config below), I have a case I don't understand: three > > tables that can be separately queried in milliseconds, but when put > > together into one view using UNION, take 150 seconds to query. Here's the > > rough idea (actual details below): > > Do you want UNION ALL ? > > UNION without ALL distintifies the output. > https://www.postgresql.org/docs/current/sql-select.html#SQL-UNION Interesting idea, thanks. But it makes no difference. Tried it and got the same bad performance. Craig > > > Justin > -- --------------------------------- Craig A. James Chief Technology Officer eMolecules, Inc. 3430 Carmel Mountain Road, Suite 250 San Diego, CA 92121 ---------------------------------
