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Create trigger trg_TableAUpdate
on tablea for update
if exists( Select top 1 1 from tablea join deleted on tablea.<id> = deleted.<id> and tablea.status='closed')
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CREATE OR REPLACE FUNCTION test_trig_f() RETURNS trigger AS
IF NEW.status='CLOSED' THEN
//do whatever processing you wanted here
LANGUAGE 'plpgsql' VOLATILE;
CREATE TRIGGER test_trig AFTER UPDATE ON test_table FOR EACH ROW
EXECUTE PROCEDURE test_trig_f();
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