mysql - 有两个表的条​​件 Mysql 事件

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
);

我有两个表贷款和收据，我正在尝试创建一个事件，以便当列 receipt_on(来自收据表)为“Principal”且列 receipt_amount(来自收据表)大于或等于列 app_principal(来自贷款表)然后将拖欠列(来自收据表)设置为 0，否则为 1。但是我的事件似乎有错误

Answer 1

尝试以下操作

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
)