T-SQL比较2用户名

Question

我有3个以下的表格。我试图比较每个用户的角色。那就是我想表明，约翰有两个角色，而简有1个。目前我只显示他们之间的共同角色。

• Sec_role (PK R_KEY, rname)
• Role_User(PK R_KEY, PK USER_KEY)
• User(PK USER_KEY, Name)

的样本数据：

Sec_Role   Role_User  User 

R_Key|rname|  R_Key|User_Key User_KEY|NAME 
1 |Analyst  1 |1   1  |John 
2 |Sysadmin 2 |1   2  |Jane 
        2 |2 

我试图让

User | Role | User2 | Role2 
John | Analyst | Jane | (Empty because she isn't an analyst) 
John | sysadmin| Jane |Sysadmin 

---

SELECT U.Name AS User1, 
     U2.Name AS User2, 
     R.rname AS Role1 
     R2.Rname AS Role2 
FROM Sec_Role AS R 
LEFT OUTER JOIN Role_User AS RU 
ON R.R_Key=RU.R_Key 
LEFT OUTER JOIN User AS U 
ON U.User_Key=RU.User_Key 

LEFT OUTER JOIN Sec_Role AS R2 
ON R2.R_Key=R.R_Key <---(I think this is the issue here) 
LEFT OUTER JOIN Role_User AS RU2 
ON R2.R_Key=RU2.R_Key 
LEFT OUTER JOIN User AS U2 
ON U2.User_Key=RU2.User_Key 

WHERE U.Name ='John' 
AND U2.Name='Jane' 

目前我得到这两个用户的交集。

User | Role | User2 | Role2 
John | sysadmin| Jane |Sysadmin 

Answer 1

WHERE U.Name ='John' 
OR U2.Name='Jane' 

音符的或不是与

为什么4列

SELECT U.Name AS User, 
      R.rname AS Role 
    FROM Sec_Role AS R 
    LEFT OUTER JOIN Role_User AS RU 
    ON R.R_Key=RU.R_Key 
    LEFT OUTER JOIN User AS U 
    ON U.User_Key=RU.User_Key 
    where uName in ('','') 
    order by 1, 2 

试试这个

SELECT U.Name AS User1, 
    U2.Name AS User2, 
    R.rname AS Role1 
    R2.Rname AS Role2 
FROM Sec_Role AS R 
LEFT OUTER JOIN Role_User AS RU 
ON R.R_Key=RU.R_Key 
LEFT OUTER JOIN User AS U 
    ON U.User_Key=RU.User_Key 
    and U.Name ='John' 

LEFT OUTER JOIN Sec_Role AS R2 
ON R2.R_Key=R.R_Key <---(I think this is the issue here) 
LEFT OUTER JOIN Role_User AS RU2 
ON R2.R_Key=RU2.R_Key 
LEFT OUTER JOIN User AS U2 
    ON U2.User_Key=RU2.User_Key 
    AND U2.Name='Jane'