I didn't try myself, but wrapping the whole into a PL/pgSQL function and using exceptions might do the work;
It's not good advice. I tested it, and problem is in where clause. I don't understand problem well, but one possibility is change from cast to to_number function like: postgres=# begin; BEGIN postgres=# declare c cursor for select * from fx where to_number(b,'99999') > 0; DECLARE CURSOR postgres=# fetch from c; a | b ----+---- 10 | 20 (1 row) postgres=# fetch from c; a | b ----+----- 10 | a20 (1 row) But still this solution is +/- correct Regards Pavel
