我正在尝试创建一个存储过程，该过程通过将订购数量与来自不同表（称为rate）的产品的比率相乘，并从bookings表中获取数量来计算数量。在计算之后，我希望将其插入另一个表“amount”。我一共有5种产品。例如，如果product=''，则将amount放入''，并将剩余产品的amount插入零。这里，我使用一个case语句抛出语法错误。请帮忙。

DELIMITER $$
CREATE PROCEDURE `calculate_amount` (IN IN_book_id INT,IN IN_qty INT )
-- begin
BEGIN
-- declare
DECLARE prdct VARCHAR(10);
DECLARE cust_id INT(5);
-- select into
SELECT Product FROM Bookings WHERE Book_id=IN_book_id INTO prdct;
SELECT Cust_id FROM Bookings WHERE Book_id=IN_book_id INTO cust_id;
-- conditionals & action
CASE prdct
WHEN "20ltr"
THEN INSERT INTO Amount(Cust_id,Book_id,Can,300ml,500ml,1lit,2lit) VALUES(cust_id,IN_book_id,(SELECT Rate.Can*Bookings.Qty FROM Rate,Bookings WHERE Bookings.Book_id=IN_book_id),0,0,0,0);

WHEN "300ml"
THEN INSERT INTO Amount(Cust_id,Book_id,Can,300ml,500ml,1lit,2lit) VALUES(cust_id,IN_book_id,0,(SELECT Rate.300ml*Bookings.Qty FROM Rate,Bookings WHERE Bookings.Book_id=IN_book_id),0,0,0); 

WHEN "500ml"
THEN 
INSERT INTO Amount(Cust_id,Book_id,Can,300ml,500ml,1lit,2lit) VALUES(cust_id,IN_book_id,0,0,(SELECT Rate.500ml*Bookings.Qty FROM Rate,Bookings WHERE Bookings.Book_id=IN_book_id),0,0); 

WHEN "1ltr"
THEN 
INSERT INTO Amount(Cust_id,Book_id,Can,300ml,500ml,1lit,2lit) VALUES(cust_id,IN_book_id,0,0,0,(SELECT Rate.1lit*Bookings.Qty FROM Rate,Bookings WHERE Bookings.Book_id=IN_book_id),0); 

WHEN "2ltr"
THEN 
INSERT INTO Amount(Cust_id,Book_id,Can,300ml,500ml,1lit,2lit) VALUES(cust_id,IN_book_id,0,0,0,0,(SELECT Rate.2lit*Bookings.Qty FROM Rate,Bookings WHERE Bookings.Book_id=IN_book_id)); 

ELSE 
    BEGIN
    END;
END CASE;
-- end
END;$$

DELIMITER ;