SQL - 僅提取Item =「Tent」的ORDID

Question

我試圖提取只有ITEM = Tent的記錄（ORDID）。例如

ID  ORDID  ITEM 

1  10  Tent 
2  10  Truck 
3  20  Tent 
4  20  Tent 
5  20  Truck 
6  30  Tent 
7  30  Tent 

結果：

ID  ORDID ITEM 

6  30  Tent 
7  30  Tent 

Answer 1

試試這個：

SELECT ID, ORDID, ITEM 
FROM YourTable 
WHERE ITEM = 'Tent' 
    AND ORDID NOT IN (SELECT DISTINCT ORDID 
        FROM YourTable 
        WHERE ITEM <> 'Tent')