=?ISO-8859-1?Q?Dennis_Bj=F6rklund?= <[EMAIL PROTECTED]> writes: > It seems to me that one would like to have a polymorphic typesystem with > constraints to handle overloading, subtyping or whatever is needed in > SQL.
What we have now is indeed pretty ad-hoc, but a full-blown type inference system might be overkill. Not sure. It would be interesting to look into it. > Is there anywhere I can read about the typesystem in SQL in general and > postgresql in particular? There's the user's guide http://developer.postgresql.org/docs/postgres/typeconv.html and there's the source code (see src/backend/parser/, particularly parse_coerce.c, parse_func.c, parse_oper.c). Not much in between I'm afraid, but the source code is reasonably well-commented. regards, tom lane ---------------------------(end of broadcast)--------------------------- TIP 1: subscribe and unsubscribe commands go to [EMAIL PROTECTED]
