On Sunday 17 April 2011 13:01:45 Robert J.C. Ivens wrote: > Hi, > > I am not sure if there ever was a feature request for using defined column > aliases in the rest of a query. This would make queries with a lot of > logic in those aliased columns a lot smaller and this easier to > write/debug. > > I already know you can use the following syntax: > > SELECT col1, col2, col3, (col2-col3) as col4 FROM (SELECT col1, (long and > lots of logic here) as col2, col3 FROM table) s WHERE col2 < aValue > > But when you need to use (calculated) values from the actual record and or > have sub-selects in your main select that also need to use these values > things get really hairy. I don't know if the SQL specification allows it > but I know that RDBMS's like Sybase already support this. > > Any thoughts?
It's easy to define a view or an SQL function and stash the hairy logic there. regards, Leif -- Sent via pgsql-general mailing list (pgsql-general@postgresql.org) To make changes to your subscription: http://www.postgresql.org/mailpref/pgsql-general
