Return rows from a PL/pgSQL function

Question

I have a procedure in PostgreSQL:

CREATE OR REPLACE FUNCTION get_geom_difference()
RETURNS void AS
$$
BEGIN
SELECT filedata.num,st_area(ST_Difference(ST_TRAN         


        

Answer 1

In your definition your function returns nothing RETURNS void. If you want num data type just change to RETURNS numeric. Also, To make it worked, perform select into some numeric variable SELECT INTO var and add return var to the end of function.