不等於搜尋有LeftJoin

Question

我有一個查詢

Select 
    m.name 

from machines m 
    innerJoin config c ON m.cod = c.cod 

--> where (c.category = 'BIOS' and c.val = 'System') 
--> and (c.category = 'Users' and c.val = 'Jonas') 

group by c.cod 

* MACHINES ---------------- + 
| key | name | cod | 
* ------ + ------- + ------ + 
| 1  | M1  | 23  | 
| 2  | M2  | 26  | 
| 3  | M3  | 27  | 
+ ------ + ------- + ------ + 

* CONFIG --------------------------- + 
| key | category | cod | val | 
+ ------ + -------- + ----- + ------ + 
| 1  | BIOS  | 23 | System | 
| 2  | Users | 23 | Jonas | 
| 3  | Users | 23 | Maria | 
| 4  | BIOS  | 26 | System | 
| 5  | Users | 26 | Jonas | 
| 6  | BIOS  | 27 | System | 
| 6  | Users | 27 | Ana | 
+ ------ + -------- + ----- + ------ + 

我得到

* RESULT -- + 
| name  | 
+ --------- + 
| M1  | 
| M2  | 
+ --------- + 

其偉大的「平等」的搜索，但我不知道我該怎麼辦「不等於」搜索此查詢。

我想：

Select 
    m.name 

from machines m 
    innerJoin config c ON m.cod = c.cod 

--> where (c.category = 'BIOS' and c.val <> 'System') 
--> or (c.category = 'Users' and c.val <> 'Jonas') 

group by c.cod 

，但仍然得到機「M1」，與價值「瑪麗亞」匹配濾波器

我需要做的與此過濾器的結果領域：

* RESULT -- + 
| name  | 
+ --------- + 
| M3  | 
+ --------- + 

我該怎麼辦呢？

Answer 1

您發佈的查詢有重複的錯誤在裏面：來自表c，不mcategory和val。

然後，在我看來，你想要的是拋棄那些指對被其他記錄你的條件存在的機器記錄。不幸的是，這不能單靠記錄條件來完成，所以沒有必要否定條件。你必須做這樣的事情：

SELECT DISTINCT name 
    FROM machines 
WHERE name NOT IN (
    SELECT m.name  
     FROM machines m 
     INNER JOIN config c USING (cod) 
     WHERE (c.category = 'BIOS' AND c.val = 'System') 
     AND (c.category = 'Users' AND c.val = 'Jonas') 
) 

Answer 2

Select 
    m.name 

from machines m 
    innerJoin config c ON m.cod = c.cod 

where NOT (
(m.category = 'BIOS' and m.val = 'System') 
and (m.category = 'Users' and m.val = 'Jonas') 
) 

group by c.cod 

Answer 3

嘗試下面的腳本：

SELECT M.Name FROM Machines AS M LEFT JOIN CONFIG AS C ON M.Cod=C.Cod 
    WHERE NOT ( 
    (M.Category ='BIOS' AND M.Val='System') AND 
    (M.Category ='Users' AND M.Val='Jonas') 
    ) 

NOT關鍵字是您所查詢的簡單的解決方案。我也做了離開加入，而不是內在，你可以忽略它，如果不需要。

Answer 4

試試這個：

SELECT name FROM machines 
WHERE name NOT IN (
SELECT m.name FROM machines m INNER JOIN config c ON m.cod = c.cod WHERE (c.category = 'BIOS' and c.val = 'System') AND (c.category = 'Users' and c.val = 'Jonas') GROUP BY c.cod) 

Answer 5

Working SQL FIDDLE

由於需要配對值有2個記錄的系統我用這個平等

這並假設category/cod/val在Config中是唯一的。

SELECT m.name 
FROM machines m 
INNER JOIN config c 
    on c.cod = m.cod 
WHERE ((c.category = 'BIOS' and c.val = 'System') 
    OR (c.category = 'Users' and c.val = 'Jonas')) 
GROUP BY m.name 
having count(*) =2 ; 

，這對於不等於......請注意，如果你有更多的「OR」條件而定

SELECT m.name 
FROM machines m 
INNER JOIN config c 
    on c.cod = m.cod 
WHERE ((c.category = 'BIOS' and c.val = 'System') 
    OR (c.category = 'Users' and c.val = 'Jonas')) 
GROUP BY m.name 
having count(*) <>2 ;