小编Ali*_*Ali的帖子

哪个查询更快：

查询 A

SELECT I.ItemName
FROM Location L
INNER JOIN Items I ON I.LocationID = L.LocationID
WHERE L.LocationID = 1

执行计划

查询 B

SELECT ItemName
FROM Items 
WHERE ItemID IN (
SELECT ItemID
FROM  Items
WHERE LocationID = 1)

执行计划