James Harper <james.harper@xxxxxxxxxxxxxxxx> writes: > is it possible to have a function that can return a different type > depending on the parameters? The data type of any expression (including a function call) has to be determinable at parse time, so no you can't just randomly return a run-time-determined data type. However, have you looked at the "polymorphic functions" feature? You can declare a function as returning the same data type that one of its inputs has. This seems to cover most of the cases that are useful in practice. http://www.postgresql.org/docs/9.3/static/extend-type-system.html#EXTEND-TYPES-POLYMORPHIC http://www.postgresql.org/docs/9.3/static/xfunc-sql.html#AEN52916 regards, tom lane -- Sent via pgsql-general mailing list (pgsql-general@xxxxxxxxxxxxxx) To make changes to your subscription: http://www.postgresql.org/mailpref/pgsql-general
