Question

从具有多个具有公共UserId键的表的SQL查询返回单行的更好方法是什么？我也提到LINK，但结果不是我想要的。

此外，他们是许多用户，他们分配了许多ModuleAccess，许多PageAccess，许多catalogAccess，只有1个UserType，只有1个SystemAccess。用户表有很多用户。

我试过这个但是没有工作：

SELECT        us.userId, us.username, us.email, us.isAdministrator, us.status, us.FullName, ut.userTypeId, ut.typeName, ut.levelName, sys.sysAccessId, sys.adminDashboard, sys.accessName, sys.standardDashboard, 
                         sys.marginChart, sys.expiringChart, sys.increasingChart, sys.viewCatalogue, sys.importList, sys.exportList, sys.masterDataMain, sys.changesNeed, md.moduleId, md.moduleName, md.moduleUrl, 
                         pg.pageId, pg.pageName, pg.pageUrl, pg.pagePermission, pg.pageAccess,cat.catAccId, cat.HasAccess
FROM            dbo.mp_Users AS us 
                         INNER JOIN dbo.mp_UserType AS ut ON us.userId = ut.userId 
                         INNER JOIN dbo.mp_PageAccess AS pg ON us.userId = pg.userId 
                         INNER JOIN dbo.mp_ModuleAccess AS md ON us.userId = md.userId 
                         INNER JOIN dbo.mp_SystemAccess AS sys ON us.userId = sys.userId 
                         INNER JOIN dbo.mp_CatalogAccess AS cat ON us.userId = cat.userId

我想要的是链接这个：

这是我当前的结果查询：

Any One有一个更好的查询SQL上面的方法吗？谢谢

_________________几次尝试________查询错误

SELECT        
    dbo.mp_Users.userId,     dbo.mp_Users.username,     dbo.mp_Users.email,     dbo.mp_Users.isAdministrator,     dbo.mp_Users.status,     dbo.mp_Users.FullName,     dbo.mp_UserType.userTypeId, 
    dbo.mp_UserType.typeName,     dbo.mp_UserType.levelName,     dbo.mp_SystemAccess.sysAccessId,     dbo.mp_SystemAccess.adminDashboard,     dbo.mp_SystemAccess.accessName,     dbo.mp_SystemAccess.standardDashboard, 
    dbo.mp_SystemAccess.marginChart,     dbo.mp_SystemAccess.expiringChart,     dbo.mp_SystemAccess.increasingChart,     dbo.mp_SystemAccess.viewCatalogue,     dbo.mp_SystemAccess.importList, 
    dbo.mp_SystemAccess.exportList,     dbo.mp_SystemAccess.masterDataMain,     dbo.mp_SystemAccess.changesNeed,     
    sum(dbo.mp_ModuleAccess.moduleId), 
    max(dbo.mp_ModuleAccess.moduleName), 
    max(dbo.mp_ModuleAccess.moduleUrl), 
    sum(dbo.mp_PageAccess.pageId), 
    max(dbo.mp_PageAccess.pageName), 
    max(dbo.mp_PageAccess.pageUrl), 
    max(dbo.mp_PageAccess.pagePermission), 
    max(dbo.mp_PageAccess.pageAccess),
    sum(dbo.mp_CatalogAccess.catAccId), 
    max(dbo.mp_CatalogAccess.HasAccess)
FROM dbo.mp_Users 
 INNER JOIN dbo.mp_UserType  ON dbo.mp_Users.userId = dbo.mp_UserType.userId 
 INNER JOIN dbo.mp_PageAccess ON dbo.mp_Users.userId = dbo.mp_PageAccess.userId 
 INNER JOIN dbo.mp_ModuleAccess ON dbo.mp_Users.userId = dbo.mp_ModuleAccess.userId 
 INNER JOIN dbo.mp_SystemAccess ON dbo.mp_Users.userId = dbo.mp_SystemAccess.userId 
 INNER JOIN dbo.mp_CatalogAccess ON dbo.mp_Users.userId = dbo.mp_CatalogAccess.userId
GROUP BY dbo.mp_Users.userId

Answer 1

您可以添加

group by userId

在代码的末尾，然后在select部分，除了userID之外的所有字段，你将不得不使用

max(fieldname)

而不是fieldname，例如

max(us.username), max(us.email)

但是，要小心。我提出了max（），因为我发现对于每个userID，你的字段的多个值都具有相同的值 - 但是，你必须确定是这种情况。如果某个字段有多个值，则必须确定以何种方式选择其中一个以在SELECT部分中显示。

以下是带max（）的字段，请谨慎使用：

SELECT        
    us.userId, 
    max(us.username), 
    max(us.email), 
    max(us.isAdministrator), 
    max(us.status), 
    max(us.FullName), 
    max(ut.userTypeId), 
    max(ut.typeName), 
    max(ut.levelName), 
    max(sys.sysAccessId), 
    max(sys.adminDashboard), 
    max(sys.accessName), 
    max(sys.standardDashboard), 
    max(ys.marginChart), 
    max(sys.expiringChart), 
    max(sys.increasingChart), 
    max(sys.viewCatalogue), 
    max(sys.importList), 
    max(sys.exportList), 
    max(sys.masterDataMain), 
    max(sys.changesNeed), 
    max(md.moduleId), 
    max(md.moduleName), 
    max(md.moduleUrl), 
    max(pg.pageId), 
    max(pg.pageName), 
    max(pg.pageUrl), 
    max(pg.pagePermission), 
    max(pg.pageAccess),
    max(cat.catAccId), 
    max(cat.HasAccess)
FROM            dbo.mp_Users AS us 
 INNER JOIN dbo.mp_UserType AS ut ON us.userId = ut.userId 
 INNER JOIN dbo.mp_PageAccess AS pg ON us.userId = pg.userId 
 INNER JOIN dbo.mp_ModuleAccess AS md ON us.userId = md.userId 
 INNER JOIN dbo.mp_SystemAccess AS sys ON us.userId = sys.userId 
 INNER JOIN dbo.mp_CatalogAccess AS cat ON us.userId = cat.userId
GROUP BY us.userId

Answer 2

I think you can :
1 use LIMIT 1 when just one row of data
2 use a fairly typed column in the Join table and index it

从具有公共UserId键的许多表的SQL查询返回单行

2 个答案: