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我试图将每个案例的行数限制为 5 行。有些案例只有 1 或 2 行，但有些案例有 15 行或更多。

这是我用来计算每个案例的行数的存储过程的示例。

SELECT     ROW_NUMBER() OVER(partition by rce.reportruncaseid ORDER BY rce.Reportruncaseid) AS Row, rce.ReportRunCaseId AS CaseId, YEAR(rce.EcoDate) AS EcoYear
FROM         PhdRpt.ReportCaseList AS rcl INNER JOIN
                  PhdRpt.RptCaseEco AS rce ON rce.ReportId = rcl.ReportId AND rce.ReportRunCaseId = rcl.ReportRunCaseId
GROUP BY rce.ReportId, rce.ReportRunCaseId, YEAR(rce.EcoDate)
Order by rce.ReportRunCaseId, YEAR(rce.EcoDate)

这是此存储过程生成的屏幕截图：screenshot

我曾尝试使用 where 子句，但它不允许我在 where 子句之后放置窗口函数。它也无法识别我的“Row”别名。

是否有另一种方法来计算每个案例的数量或行数（而不是窗口函数），以便我可以使用 where 子句？或者有没有办法使用我现有的存储过程将每个案例的记录限制为 5？

预先感谢您的帮助。

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1 回答 1

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您可以将您的声明包装在 aCTE因为SQL Server支持它。

WITH records
AS
(
    SELECT  ROW_NUMBER() OVER(PARTITION BY rce.reportruncaseid 
                              ORDER BY rce.Reportruncaseid) AS Row, 
            rce.ReportRunCaseId AS CaseId, 
            YEAR(rce.EcoDate) AS EcoYear
    FROM    PhdRpt.ReportCaseList AS rcl 
                INNER JOIN PhdRpt.RptCaseEco AS rce 
                    ON  rce.ReportId = rcl.ReportId 
                        AND rce.ReportRunCaseId = rcl.ReportRunCaseId
    GROUP   BY rce.ReportId, rce.ReportRunCaseId, YEAR(rce.EcoDate)
)
SELECT CaseId, EcoYear
FROM   records
WHERE  row <= 10
ORDER  BY CaseId, EcoYear
于 2013-04-25T14:35:59.747 回答