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DROP TABLE IF EXISTS salaries;
CREATE TABLE salaries (
employeeNumber INT PRIMARY KEY,
validFrom DATE NOT NULL,
amount DEC(12 , 2 ) NOT NULL DEFAULT 0
);
INSERT INTO salaries(employeeNumber,validFrom,amount)
VALUES
(1002,'2000-01-01',50000),
(1056,'2000-01-01',60000),
(1076,'2000-01-01',70000);
DROP TABLE IF EXISTS SalaryArchives;
CREATE TABLE SalaryArchives (
id INT PRIMARY KEY AUTO_INCREMENT,
employeeNumber INT,
validFrom DATE NOT NULL,
amount DEC(12 , 2 ) NOT NULL DEFAULT 0,
deletedAt TIMESTAMP DEFAULT NOW()
);
DROP TRIGGER IF EXISTS before_salaries_delete;
DELIMITER $$
CREATE TRIGGER before_salaries_delete
BEFORE DELETE
ON salaries FOR EACH ROW
BEGIN
INSERT INTO SalaryArchives(employeeNumber,validFrom,amount)
VALUES(OLD.employeeNumber,OLD.validFrom,OLD.amount);
END$$
DELIMITER ;
DELETE FROM salaries WHERE employeeNumber = 1002;