MySQL与计数的比较

Question

我正在尝试更新活动字段并根据有多少产品已发送给客户进行设置。但它没有按预期工作。我有一些recordShipped比totalIssues大但isActive没有被设置为false。

UPDATE xatm.subscriptions a, 
     (SELECT idSubscription, COUNT(idProduct) issueShipped 
     FROM xatm.subscriptionshipments 
     group by idSubscription) b 
SET a.isActive = (a.totalIssues > b.issueShipped) 
WHERE a.idsubscriptions = b.idSubscription 
AND a.isComp = 0 AND a.isReoccurring = 0; 

Answer 1

其实，我觉得你当前的查询应该工作，但在任何情况下，你可以尝试将是一个更新的替代联接：

UPDATE xatm.subscriptions a 
INNER JOIN 
(
    SELECT idSubscription, COUNT(idProduct) issueShipped 
    FROM xatm.subscriptionshipments 
    GROUP BY idSubscription 
) b 
    ON a.idsubscriptions = b.idSubscription 
SET a.isActive = (a.totalIssues > b.issueShipped) 
WHERE 
    a.isComp = 0 AND 
    a.isReoccurring = 0;