Question

此查询有效：

SELECT     u.UserId, u.GroupId, u.username,
            gp.PreferenceId, gp.Properties, gp.Override
        FROM          dbo.UserTable u 
        Inner JOIN
            dbo.GroupPreferences gp ON gp.GroupID = u.GroupId
        WHERE      (u.UserName = 'myUserId')

但是另一个查询中的相同查询却没有。我收到错误“无效的列名'GroupId'”和“无效的列名'UserId'”。我想有一个额外的（或）某个地方;请帮帮我找到它！

外部查询：

SELECT     coalesce(t1.PreferenceId,up.preferenceId) 
        as preferenceId, CASE t1.override WHEN 1 THEN COALESCE 
        (up.properties, t1.properties) 
        When 0 then t1.properties   
        ELSE up.properties END AS Properties
    FROM         
        (SELECT     u.UserId, u.GroupId, u.username,
            gp.PreferenceId, gp.Properties, gp.Override
        FROM          dbo.UserTable u 
        Inner JOIN
            dbo.GroupPreferences gp ON gp.GroupID = u.GroupId
        WHERE      (u.UserName = 'myUserId')) t1 
    full OUTER JOIN
        (select preferenceId, properties from UserPreferences u
        inner join userTable t on u.userId = t.userId and u.GroupId = 
        t.GroupId where userName = 'myUserId') up 
    ON t1.GroupId = up.GroupID AND t1.UserId = up.UserId
        AND t1.PreferenceId = up.PreferenceId

Answer 1

您从内联视图别名GroupId引用了列UserId和up，但它的选择列表中不包含这些列。

更改第14行以包含这些列：

(select t.GroupId, t.userId, preferenceId, properties from UserPreferences u

Answer 2

此

(select preferenceId, properties from UserPreferences u
        inner join userTable t on u.userId = t.userId and u.GroupId = 
        t.GroupId where userName = 'myUserId') up

没有up.GroupID或up.UserId

ON t1.GroupId = up.GroupID AND t1.UserId = up.UserId

帮助调试sql查询：我在哪里有额外的（或）？

2 个答案: