[英]SQL Server row_number
我在使用别rownumber
创建自定义行号时rownumber
问题。 以下是一些示例数据:
表question
:
id title
-- --------
1 xx
2 xxx
..
表customerLikeQuestion
:
Id QuestionId CustomerId
---------------------------
1 20 xx
2 100 xx
xx
查询:
SELECT q.Id,
(SELECT COUNT(*)
FROM dbo.CustomerLikeQuestion
WHERE (QuestionId = q.Id)) AS LikeCount
FROM dbo.Question AS q
ORDER BY likecount DESC
上一个查询显示:
id LikeCount
2136 6
2138 5
2150 5
现在,我想输入一个rownumber
来计算一行的递增顺序。 我尝试了以下查询:
SELECT TOP (100) PERCENT Id,
(SELECT COUNT(*) AS Expr1
FROM dbo.CustomerLikeQuestion
WHERE (QuestionId = q.Id)) AS LikeCount,
row_number() over (order by likecount) as RowNum
FROM dbo.Question AS q
ORDER BY likecount DESC
但这给了我以下错误:
列Likecount无效。
我确实知道Over()
无法使用别名,但是如何解决这个问题(无论是CTE还是子查询),我还没有想到。 请帮忙。
正确的结果应该是这样的:
id likecount, rownum
----------------------
xx 6 1
xx 5 2
xx 4 3
.. 0 xx
试试这个
;WITH LiksCounts
AS
(
SELECT Id,
(SELECT COUNT(*) AS Expr1
FROM dbo.CustomerLikeQuestion
WHERE (QuestionId = q.Id)) AS LikeCount
FROM dbo.Question AS q
GROUP BY Id
)
SELECT TOP(100) *, row_number() over (order by likecount) as RowNum
fROM LiksCounts
ORDER BY RowNum ASC
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