OK Albe, thanks for info
2013/2/1 Albe Laurenz <laurenz.a...@wien.gv.at> > 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 >
