Marko Rihtar wrote: > maybe you can help me with this issue. > Here is an example > > SELECT NULL::integer > UNION ALL > SELECT NULL > UNION ALL > SELECT 123 > > For this sql to work i have to cast NULL to integer. > I was wondering if there exists some configuration parameter at database > level that can be used to > avoid this need for explicit casting?
Not that I know of. The behaviour is well defined and documented, see http://www.postgresql.org/docs/current/static/typeconv-union-case.html The UNIONs are computed left to right, and the data type in the first UNION resolves to "text" according to rule 2 of the page given above. You can reorder the UNIONs or use parentheses. Yours, Laurenz Albe -- Sent via pgsql-admin mailing list (pgsql-admin@postgresql.org) To make changes to your subscription: http://www.postgresql.org/mailpref/pgsql-admin
