操作数应该包含1列存储过程

Question

我正在尝试在一个过程中使用多选来分配变量的值。 但我得到这样的错误“操作数应包含1列（S）” 这是我的代码：

DELIMITER $$ 

DROP PROCEDURE IF EXISTS `bankdb`.`charge` $$ 
CREATE PROCEDURE `bankdb`.`charge`() 
BEGIN 
    DECLARE idcust_val INT; 
    DECLARE balance_val FLOAT; 
    DECLARE balance_val1 FLOAT; 
    DECLARE balance_val2 FLOAT; 
    DECLARE productCd_val VARCHAR(10); 
    DECLARE productType_val VARCHAR(10); 
    DECLARE no_more_rows INT DEFAULT 0; 
    DECLARE num_rows INT DEFAULT 0; 

    DECLARE col_cur CURSOR FOR 
    select a.cust_id, a.avail_balance, a.product_cd, p.product_type_cd 
    from account a, product p 
    where a.product_cd = p.product_cd; 
    DECLARE CONTINUE HANDLER FOR NOT FOUND SET no_more_rows = 1; 

    OPEN col_cur; 
    select FOUND_ROWS() into num_rows; 

    read_loop: LOOP 
    IF no_more_rows THEN 
    CLOSE col_cur; 
    LEAVE read_loop; 
    END IF; 
    FETCH col_cur INTO idcust_val, balance_val, productCd_val, productType_val; 
    SELECT idcust_val, balance_val, productCd_val; 
    IF productType_val = 'ACCOUNT' THEN 
     IF productCd_val = 'SAV' || productCd_val = 'CD' THEN 
     IF balance_val < 2000 THEN 
       SELECT (balance_val-10) INTO balance_val; 
     END IF; 
     ELSE 
     SELECT (balance_val+(balance_val*0,05)) INTO balance_val; 
     END IF; 
    ELSE 
     SELECT (balance_val-(balance_val*0,1)) INTO balance_val; 
    END IF; 
    /*UPDATE account SET avail_balance = balance_val WHERE account_id = idcust_val;*/ 
    END LOOP read_loop; 
END $$ 
DELIMITER ; 

请帮助！

Answer 1

将小数点'，'更改为'。'

0,05 -> 0.05 
0,1 - 0.1