兩個表

Question

CREATE EVENT myevent4 
ON SCHEDULE EVERY '1' MINUTE 
DO 
UPDATE receipt r 
inner join loan l 
on l.l_app_file_id=r.r_app_file_id 
SET delinquent = (
    if r.receipt_on='Principal' AND r.receipt amount >= l.app_principal 
    THEN 1 
    ELSE 0 

    END 
); 

我有兩個表的貸款和接收條件MySQL事件，我想創建一個事件，這樣，當列receipt_on（從收到表）是「委託人」和列receipt_amount（從收到表）大於或等於柱app_principal（從貸款表），然後設置列拖欠（從收到表）爲0，否則，1 不過似乎有一個錯誤在我的事件

Answer 1

嘗試以下

CREATE EVENT myevent4 
ON SCHEDULE EVERY '1' MINUTE 
DO 
UPDATE receipt r 
inner join loan l 
on l.l_app_file_id=r.r_app_file_id 
SET delinquent = (
    case when r.receipt_on='Principal' AND r.receipt amount >= l.app_principal 
    THEN 1 
    ELSE 0 

    END 
)