Sql WHERE子句未按预期运行

我正在尝试连接一些表以接收一些数据，但它没有按预期工作。我的问题是：

SELECT USR.PK_User AS PKUser
    ,USR.NAME AS NAME
FROM [User] USR
LEFT JOIN aspnet_Users ASPU ON USR.NAME = ASPU.UserName
LEFT JOIN aspnet_UsersInRoles ASPUIR ON ASPU.UserId = ASPUIR.UserId
WHERE ASPUIR.RoleId = 'E8700479-902A-42F1-A500-4FA02CAC356C'

此查询未返回任何内容。但如果我这样做：

SELECT * FROM [aspnet_UsersInRoles] WHERE RoleId = 'E8700479-902A-42F1-A500-4FA02CAC356C'

我选择了76行。如果我这样做：

SELECT USR.PK_User AS PKUser
    ,USR.NAME AS NAME
FROM [User] USR
LEFT JOIN aspnet_Users ASPU ON USR.NAME = ASPU.UserName
LEFT JOIN aspnet_UsersInRoles ASPUIR ON ASPU.UserId = ASPUIR.UserId

我返回了预期的行。此外，如果我添加：

WHERE ASPUIR.RoleId IS NULL 

我又被吵醒了

---

我做错了什么？

您需要的是ON而不是WHERE中的条件

否则，您只需将其有效地恢复为内部联接

SELECT USR.PK_User AS PKUser,
       USR.NAME    AS NAME
FROM   [User] USR
       LEFT JOIN aspnet_Users ASPU
         ON USR.NAME = ASPU.UserName
       LEFT JOIN aspnet_UsersInRoles ASPUIR
         ON ASPU.UserId = ASPUIR.UserId
            AND ASPUIR.RoleId = 'E8700479-902A-42F1-A500-4FA02CAC356C' 

---

你需要的是“在哪里”，而不是“在哪里”

否则，您只需将其有效地恢复为内部联接

SELECT USR.PK_User AS PKUser,
       USR.NAME    AS NAME
FROM   [User] USR
       LEFT JOIN aspnet_Users ASPU
         ON USR.NAME = ASPU.UserName
       LEFT JOIN aspnet_UsersInRoles ASPUIR
         ON ASPU.UserId = ASPUIR.UserId
            AND ASPUIR.RoleId = 'E8700479-902A-42F1-A500-4FA02CAC356C' 

试试这个：-

SELECT USR.PK_User AS PKUser,
   USR.NAME    AS NAME
FROM   [User] USR
   LEFT JOIN aspnet_Users ASPU
     ON USR.NAME = ASPU.UserName
   LEFT JOIN aspnet_UsersInRoles ASPUIR
     ON ASPU.UserId = ASPUIR.UserId
        AND ASPUIR.RoleId = 'E8700479-902A-42F1-A500-4FA02CAC356C' 

试试这个：-

SELECT USR.PK_User AS PKUser,
   USR.NAME    AS NAME
FROM   [User] USR
   LEFT JOIN aspnet_Users ASPU
     ON USR.NAME = ASPU.UserName
   LEFT JOIN aspnet_UsersInRoles ASPUIR
     ON ASPU.UserId = ASPUIR.UserId
        AND ASPUIR.RoleId = 'E8700479-902A-42F1-A500-4FA02CAC356C'