MySQL與計數的比較

Question

我正在嘗試更新活動字段並根據有多少產品已發送給客戶進行設置。但它沒有按預期工作。我有一些recordShipped比totalIssues大但isActive沒有被設置爲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

其實，我覺得你當前的查詢應該工作，但在任何情況下，你可以嘗試將是一個更新的替代聯接：

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;