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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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