问题描述
我想列出PolicyID表中的所有Policy，但包含PolicyID的{{1}}除外。
有3个表：
jewels在1.Policy (PolicyID)
2.ContentGroup(ContentGroupID,Description)
3.ContentItem(PolicyID,ContentGroupID)
中包含“ Description”
这是我的代码：
jewels运行代码时，我仍然显示所有包含SELECT A.PolicyID,A.EffectiveFromDate,A.PropertyId
FROM (Policy AS A INNER JOIN ContentItem AS C ON A.PolicyID = C.PolicyID)
INNER JOIN ContentGroup as G
ON C.ContentGroupID = G.ContentGroupID
WHERE NOT G.Description IN (SELECT Description FROM ContentGroup as G WHERE G.Description Like "jewels")
GROUP BY A.PolicyID,A.PropertyId;
的策略。而且我尝试了一些其他方法，例如jewels，Not like到!=，但它似乎不适用于MS访问
解决方法
我猜您想使用HAVING子句进行聚合：
SELECT P.PolicyID,P.EffectiveFromDate,P.PropertyId
FROM (Policy AS P INNER JOIN
ContentItem AS C
ON P.PolicyID = CI.PolicyID
) INNER JOIN
ContentGroup as G
ON CG.ContentGroupID = CG.ContentGroupID
GROUP BY A.PolicyID,A.EffectiveFromDate,A.PropertyId
HAVING SUM(IIF(CG.Description Like "jewels",1,0)) = 0;
HAVING子句计算每个组中具有"jewels"描述的行数。 = 0表示没有。