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）是＆＃39; Principal＆＃39;和column receipt_amount（来自收据表）大于或等于列app_principal（来自贷款表），然后将列deinquent（从收据表）设置为0，否则为1。 但是我的活动似乎有错误

Answer 1

尝试以下

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
)