There some documentation about aggregate functions in the manual, for example: http://www.postgresql.org/docs/7.4/static/sql-createaggregate.html
Here's a simple agg function that should work for you, assuming your col types are int4. CREATE AGGREGATE andsum ( sfunc = int4and, basetype = int4, stype = int4 ); TJ ---------------------------(end of broadcast)--------------------------- TIP 4: Don't 'kill -9' the postmaster
