-----Original Message----- From: pgsql-general-owner@xxxxxxxxxxxxxx [mailto:pgsql-general-owner@xxxxxxxxxxxxxx] On Behalf Of Jon Smark Sent: Thursday, January 26, 2012 9:38 AM To: pgsql-general@xxxxxxxxxxxxxx Subject: Let-bindings in SQL statements Hi, Is it possible to do the equivalent of let-bindings in a pure SQL function? I have a SELECT that invokes "now" multiple times. It would be nicer to do it only once and reuse the value. Something like this: LET right_now = SELECT now () IN SELECT * FROM my_table WHERE right_now >= start AND ... In PL/pgSQL this is easy, but I wonder about SQL... Thanks in advance! Jon ----------------------------------------------------------------------- No, not really. In some cases you can use a CTE (WITH) clause to create a single row with whatever names and values you need and then, using Sub-Selects or CROSS JOIN, introduce that row into the appropriate parts of the query. David J. -- Sent via pgsql-general mailing list (pgsql-general@xxxxxxxxxxxxxx) To make changes to your subscription: http://www.postgresql.org/mailpref/pgsql-general
