我對MySQL不太熟悉,我嘗試創建一個MySQL過程,從表中選擇兩個字段,將它們分配給一個變量,然後使用這些變量的值更新另一個表中的另一個字段,到目前爲止,這是代碼我有,但是當我運行它,我得到這個錯誤:我在這個過程查詢中做錯了什麼?
ERROR 1064 (42000): You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near 'SET @amnt = (SELECT
initial_payment FROM
pH值WHERE
PAYMENT_STATUS = 'unconf' at line 5
這是我的代碼:
DELIMITER //
CREATE PROCEDURE check_for_days()
BEGIN
SET @i = (SELECT COUNT(*) FROM `ph` WHERE `payment_status` = 'unconfirmed' && TIMESTAMPDIFF(DAY, `date_paired`, NOW()) > 2) ;
label1:WHILE @i>0
SET @amnt = (SELECT `initial_payment` FROM `ph` WHERE `payment_status` = 'unconfirmed' && TIMESTAMPDIFF(DAY, `date_paired`, NOW()) > 2 LIMIT 1);
SET @id_to_cred = (SELECT `to_pay_id` FROM `ph` WHERE `payment_status` = 'unconfirmed' && TIMESTAMPDIFF(DAY, `date_paired`, NOW()) > 2 LIMIT 1);
UPDATE `gh` SET `remaining_to_get` = + @amnt WHERE `u_id` = @id_to_cred;
DELETE FROM `ph` WHERE `payment_status` = 'unconfirmed' && TIMESTAMPDIFF(DAY, `date_paired`, NOW()) > 2 LIMIT 1;
SET @i = @i - 1;
END WHILE label1;
END
DELIMITER ;
它的'設置@i:= ...' – GurV
問* *另一個問題。提供樣本數據,所需結果以及存儲過程應該執行的操作的解釋。 –