合併兩個SQL查詢 - COUNT和WHERE

Question

我想這兩個SQL查詢相結合，以顯示與1層​​的在這也有2的ITEMID和1

訪問接入列最高計數的用戶名

我將如何結合這兩個陳述來產生這個結果？

顯示具有最高權限的帳戶：

SELECT UserName, COUNT(Access) AS Count 
FROM Permissions 
GROUP BY UserName, Access 
HAVING Access = 1 
ORDER BY Count DESC 

Result: 
Username AccessCount 
user1  2 
user2  1 
user3  2 

顯示所有賬戶數據管理器訪問：

SELECT UserName FROM Permissions 
where itemid = 2 AND Access = 1 

Result: 
Username 
user1 
user2 

權限表樣本數據：

itemID UserName Access 
1  user1  1 
2  user1  1 
3  user1  1 
1  user2  0 
2  user2  1 
3  user2  0 
1  user3  1 
2  user3  0 
3  user3  1 

其結果將是user1，因爲他們可以訪問itemID 2和最高訪問次數。

Answer 1

SQLFiddle demo here

SELECT TOP 1 UserName, COUNT(Access) AS Count 
FROM Permissions ps 
WHERE Access = 1 
AND 
userNAme in 
    (SELECT UserName 
     FROM Permissions 
     where itemid = 2 
      AND Access = 1 
    ) 
GROUP BY UserName 
ORDER BY Count DESC 

Answer 2

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