SQL INNER JOIN + SELECT NOT EXIST ID's

Question

我有三个 table：

Table一：用户

Table二：角色

Table三：UserInRoles

用户

UserID                                |  FullName
--------------------------------------------------
07DCEE4A-6598-42E1-95C6-0390FF8BB534  | John Doe

角色

RoleID
---------------------------------------
E5C46F8E-EE6A-4052-AABA-08184E5F0158

用户角色

UserID                               | RoleID
---------------------------------------------------------------------------
07DCEE4A-6598-42E1-95C6-0390FF8BB534 | E5C46F8E-EE6A-4052-AABA-08184E5F0158

我需要 Select 所有 UsersID 不在 table UserInRoles 来自 table Users

我试过了：

SELECT DISTINCT Users.UserId, Users.FullName 
FROM Users 
INNER JOIN UserInRoles 
ON Users.UserId <> UserInRoles.UserId

Answer 1

认为 NOT IN 或 NOT EXISTS:

select u.*
from users u
where not exists (select 1 from UserInRules ur where u.UserId = ur.UserId);

Answer 2

对于 Select 所有不在 table UserInRoles 中的用户 ID 来自 table 用户，只需使用 not in

select distinct * from users where userid not in
(select userid from UserInroles)

SQL INNER JOIN + SELECT NOT EXIST ID's

SQL INNER JOIN + SELECT NOT EXIST ID's

sql

sql-server

mssql-jdbc