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Question

我有以下SQL查詢差強人意：

SELECT 
    Count(ExtCardID) as CardCount 
from 
    CardIDs CARDS with (NoLock) 
inner join 
    (select CustomerPK 
    from GroupMembership with (NoLock) 
    where CustomerGroupID = 14 and Deleted = 0) as GM on GM.CustomerPK = CARDS.CustomerPK 

以下Select部分從上述聯接返回的800萬個記錄：

select 
    CustomerPK from GroupMembership with (NoLock) 
where 
    CustomerGroupID = 14 and Deleted = 0 

是否有更好的辦法寫上面的sql代碼？請指教。

Answer 1

你用LINQ試過了嗎？

LINQ是相當不錯的，而不是直接查詢！

Great Article