Question

我通常在子查询中使用COUNT来获取所需的数字，但在这种情况下，我需要一些帮助，因为查询包含太多参数。

SELECT a.[QueueID]
  ,a.[CouponID]
  ,a.[ListingID]
  ,a.[User_ID]
  ,b.[CouponID]
  ,b.[ListingID]
  ,b.[CouponActive] 
  ,b.[CouponExpire] 
  ,b.[IsDeleted]
  ,c.[ListingID]
  ,c.[TypeID]
  ,c.[LevelID]
  ,@passedUserID as User_ID

FROM CouponQueue a
JOIN Coupon b
    on a.CouponID = b.CouponID
JOIN Listing c
    on b.ListingID = c.ListingID

WHERE (a.[User_ID] = @passedUserID)
AND (b.[CouponActive] = 1)
AND (b.[IsDeleted] = 0)
AND (b.[CouponExpire] > DATEADD(dd, -1, GETDATE()) OR b.[CouponExpire] IS NULL)

因此，假设此查询返回7行的结果。我需要的只是我的VIEW的这个数字。所以我想将最终结果限制为一行，以便最终得到：

[TotalCount] <-- Field name
[7] <-- Result

但不是7行数据..我只需要从上面的查询计数。仍然插手并试图学习。我看了几个其他的例子，但我没有找到一个具备所有条件的......这就是搞砸了我的原因。请帮忙！

非常感谢你！

Answer 1

这对你有用吗？

select count(*) as TotalCOunt from (
SELECT a.[QueueID] /* 
  ,a.[CouponID]
  ,a.[ListingID]
  ,a.[User_ID]
  ,b.[CouponID]
  ,b.[ListingID]
  ,b.[CouponActive] 
  ,b.[CouponExpire] 
  ,b.[IsDeleted]
  ,c.[ListingID]
  ,c.[TypeID]
  ,c.[LevelID]
  ,@passedUserID as User_ID */

FROM CouponQueue a
JOIN Coupon b
    on a.CouponID = b.CouponID
JOIN Listing c
    on b.ListingID = c.ListingID

WHERE (a.[User_ID] = @passedUserID)
AND (b.[CouponActive] = 1)
AND (b.[IsDeleted] = 0)
AND (b.[CouponExpire] > DATEADD(dd, -1, GETDATE()) OR b.[CouponExpire] IS NULL)
) t

您可以删除计数列。它们实际上并不是必需的。

Answer 2

应该只能添加COUNT（*）：

SELECT COUNT(*) as TotalCount    
FROM CouponQueue a
JOIN Coupon b
    on a.CouponID = b.CouponID
JOIN Listing c
    on b.ListingID = c.ListingID
WHERE (a.[User_ID] = @passedUserID)
AND (b.[CouponActive] = 1)
AND (b.[IsDeleted] = 0)
AND (b.[CouponExpire] > DATEADD(dd, -1, GETDATE()) OR b.[CouponExpire] IS NULL)

祝你好运。

Answer 3

您可以将以下示例放在SQL Developer上以进行计数：

SELECT count(*) as totalCount (*-open a parentheses - your original query -close the parentheses*)

需要来自更复杂查询的COUNT

3 个答案: