如何在联合之间的SQL中放置ORDER BY子句

我想实现一个简单的SQL查询，它将返回一个排序列表。问题是，我把

ORDER BY

子句放在任何地方都会出现语法错误

SELECT 
    fr.FunctionRoleID, fr.FunctionRoleInternalName
FROM 
    users u 
JOIN 
    UserRoles ur ON ur.UserID = u.UserID
JOIN 
    Roles_FunctionRoles rfr ON rfr.RoleID = ur.RoleID
JOIN 
    FunctionRoles fr ON fr.FunctionRoleID = rfr.FunctionRoleID 
WHERE 
    u.UserName = @UserName
    AND u.Active = 1

UNION 

SELECT 
    fr.FunctionRoleID, fr.FunctionRoleInternalName
FROM 
    Roles r
JOIN 
    Roles_FunctionRoles rfr ON rfr.RoleID = r.RoleID
JOIN 
    FunctionRoles fr ON fr.FunctionRoleID = rfr.FunctionRoleID
WHERE 
    r.RoleName = 'Authenticated Users'
    AND @UserName IS NOT NULL
    AND LEN(@UserName) > 0

我想插入的内容：

ORDER BY fr.DisplayName ASC

编辑

如果我使用

SELECT * 
FROM 
     (
     [my initial query]
     )
ORDER BY 
    [COLUMN NAME] ASC

我收到以下错误消息：

“ORDER”附近的语法不正确。应为“AS”、“ID”或“QUOTED\u ID”

我不是在IDE前面，所以语法可能有点不正确，但这就是我的想法

---

e:是的，我想我应该把语法升级了……alias加了：）

在大多数数据库中，你只能在一个联合的末尾下一个

订单

因为联合会抽象出各个表别名，所以您只需列出列名。因此，省略
fr.
：

ORDER BY DisplayName

试一试

基本上，您是根据联合的结果进行选择，然后通过以下方式执行排序…注意，我使用“FunctionRoleInternalName”…您可以将其更改为“DiaplayName”，仅当您在联合查询中将其用作列别名时…例如。“FunctionRoleInternalName AS DisplayName”
ORDER BY子句需要放在Union的最后一个SELECT语句之后。
对于Union

，

ORDER BY

位于末尾，并应用于两个查询的组合结果；不能按未被联合中的两个查询选择的列排序

您需要做的是在两个查询中选择fr.DisplayName；那你就可以点了

---

如果您不希望显示名称成为输出列之一，请将整个内容嵌套在一个外部查询中，该查询只检索您想要的列。

您没有选择

DisplayName

，因此您不能使用它对从

联合派生的集合进行
排序。如果您想按它排序并从结果中忽略它

;WITH T (FunctionRoleID, FunctionRoleInternalName, DisplayName) AS (
    SELECT 
        fr.FunctionRoleID, fr.FunctionRoleInternalName, fr.DisplayName
    FROM users u
        JOIN UserRoles ur ON ur.UserID = u.UserID
        JOIN Roles_FunctionRoles rfr ON rfr.RoleID = ur.RoleID
        JOIN FunctionRoles fr ON fr.FunctionRoleID = rfr.FunctionRoleID 
    WHERE 
        u.UserName = @UserName
    AND 
        u.Active = 1

    UNION

    SELECT 
        fr.FunctionRoleID, fr.FunctionRoleInternalName, fr.DisplayName
    FROM 
        Roles r
        JOIN Roles_FunctionRoles rfr ON rfr.RoleID = r.RoleID
        JOIN FunctionRoles fr ON fr.FunctionRoleID = rfr.FunctionRoleID
    WHERE 
        r.RoleName = 'Authenticated Users'
        and @UserName is not null and LEN(@UserName) > 0
)
SELECT 
    FunctionRoleID, FunctionRoleInternalName
FROM T
    ORDER BY DisplayName

不需要子查询，尽管它不会伤害eitherOk，我只是尝试了这种方法，我得到了另一个错误消息：“ORDER”附近的语法不正确。应为'AS'、'ID'或'QUOTED_ID'，请记住在派生表中添加别名。大多数RDBMS要求它缺少派生表的别名。这很好，但有一件事，您必须从最后一次选择中删除表别名
.fr
，只需使用列名
FunctionRoleID
即可完美工作+用于捕获该DisplayName的1不在选择列表中：）
SELECT * FROM (

SELECT  
    fr.FunctionRoleID, fr.FunctionRoleInternalName 



FROM  
    users u  
    JOIN UserRoles ur ON ur.UserID = u.UserID 
    JOIN Roles_FunctionRoles rfr ON rfr.RoleID = ur.RoleID 
    JOIN FunctionRoles fr ON fr.FunctionRoleID = rfr.FunctionRoleID  


WHERE  
    u.UserName = @UserName 
AND  
    u.Active = 1 


UNION  

    SELECT  
        fr.FunctionRoleID, fr.FunctionRoleInternalName 
    FROM  
        Roles r 
        JOIN Roles_FunctionRoles rfr ON rfr.RoleID = r.RoleID 
        JOIN FunctionRoles fr ON fr.FunctionRoleID = rfr.FunctionRoleID 
    WHERE  
        r.RoleName = 'Authenticated Users' 
        and @UserName is not null and LEN(@UserName) > 0 ) a

ORDER BY a.FunctionRoleInternalName ASC

;WITH T (FunctionRoleID, FunctionRoleInternalName, DisplayName) AS (
    SELECT 
        fr.FunctionRoleID, fr.FunctionRoleInternalName, fr.DisplayName
    FROM users u
        JOIN UserRoles ur ON ur.UserID = u.UserID
        JOIN Roles_FunctionRoles rfr ON rfr.RoleID = ur.RoleID
        JOIN FunctionRoles fr ON fr.FunctionRoleID = rfr.FunctionRoleID 
    WHERE 
        u.UserName = @UserName
    AND 
        u.Active = 1

    UNION

    SELECT 
        fr.FunctionRoleID, fr.FunctionRoleInternalName, fr.DisplayName
    FROM 
        Roles r
        JOIN Roles_FunctionRoles rfr ON rfr.RoleID = r.RoleID
        JOIN FunctionRoles fr ON fr.FunctionRoleID = rfr.FunctionRoleID
    WHERE 
        r.RoleName = 'Authenticated Users'
        and @UserName is not null and LEN(@UserName) > 0
)
SELECT 
    FunctionRoleID, FunctionRoleInternalName
FROM T
    ORDER BY DisplayName