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CREATE TABLE SupplierProducts (
supplierId INT,
productId INT,
PRIMARY KEY (supplierId , productId)
);
DELIMITER $$
CREATE PROCEDURE InsertSupplierProduct(
IN inSupplierId INT,
IN inProductId INT
)
BEGIN
-- exit if the duplicate key occurs
DECLARE EXIT HANDLER FOR 1062
BEGIN
SELECT CONCAT('Duplicate key (',inSupplierId,',',inProductId,') occurred') AS message;
END;
-- insert a new row into the SupplierProducts
INSERT INTO SupplierProducts(supplierId,productId)
VALUES(inSupplierId,inProductId);
-- return the products supplied by the supplier id
SELECT COUNT(*)
FROM SupplierProducts
WHERE supplierId = inSupplierId;
END$$
DELIMITER ;
CALL InsertSupplierProduct(1,1);
CALL InsertSupplierProduct(1,2);
CALL InsertSupplierProduct(1,3);
CALL InsertSupplierProduct(2,3);