不存在：选择未分配给特定项目的帐户？

Question

好吧我有一个Project_Assigned表，其中包含分配给project_id的account_ids列表。

下面我试图收集当前未分配给特定项目的所有客户端的列表。

目前下面的查询如果没有客户端与特定项目相关联，但只要我将一个客户端分配给项目，结果集将不返回任何内容，而应返回所有未分配给其他客户端的客户端该项目。

SELECT Account.Account_ID, 
Client.First_Name AS `First_Name`, Client.Last_Name AS `Last_Name`, Client.Profile_Pic, Client.Job_Title, Client.Company_Name 
FROM Client 
LEFT JOIN Account ON (Account.Account_ID = Client.Client_ID) 
LEFT JOIN `Admin_Agency` ON (Client.Agency_ID_FK = Admin_Agency.Agency_ID) 
WHERE Account.Access_Type = 'Client' && NOT EXISTS 

(SELECT Account.Account_ID, Account.Access_Type 
FROM `Project_Assigned` projects 
INNER JOIN `Account` ON (projects.AccountID = Account.Account_ID) 
INNER JOIN `Project` ON (projects.ProjectID = Project.Project_ID) 
LEFT JOIN `Client` ON (Account.Account_ID = Client.Client_ID) 
WHERE projects.ProjectID = 48 && Account.Access_Type = 'Client'); 

表Project_Assigned：

+-----------+-----------+ 
| ProjectID | AccountID | 
+-----------+-----------+ 
|   4 |   3 | 
|   4 |   4 | 
|   4 |   5 | 
|   4 |   6 | 
|  12 |   1 | 
|  12 |  11 | 
|  12 |  12 | 
|  29 |  18 | 
|  31 |  18 | 
|  46 |  18 | 
|  48 |  18 | 
|  48 |  12 | 
+-----------+-----------+ 

Answer 1

这很可能是我误解你的模式，或你的需求，但它听起来像是你只是想这样的：

SELECT Client_ID, First_Name, Last_Name, Profile_Pic, Job_Title, Company_Name 
    FROM Client 
WHERE Client_ID IN 
     (SELECT Account_ID 
      FROM Account 
      WHERE Access_Type = 'Client' 
     ) 
    AND Client_ID NOT IN 
     (SELECT Account_ID 
      FROM Project_Assigned 
      WHERE ProjectID = 48 
     ) 
; 

没有？