Edit C:\Program Files (x86)\PostgreSQL\9.5\doc\extension\moddatetime.example
DROP TABLE mdt; CREATE TABLE mdt ( id int4, idesc text, moddate timestamp DEFAULT CURRENT_TIMESTAMP NOT NULL ); CREATE TRIGGER mdt_moddatetime BEFORE UPDATE ON mdt FOR EACH ROW EXECUTE PROCEDURE moddatetime (moddate); INSERT INTO mdt VALUES (1, 'first'); INSERT INTO mdt VALUES (2, 'second'); INSERT INTO mdt VALUES (3, 'third'); SELECT * FROM mdt; UPDATE mdt SET id = 4 WHERE id = 1; UPDATE mdt SET id = 5 WHERE id = 2; UPDATE mdt SET id = 6 WHERE id = 3; SELECT * FROM mdt;
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