限制每个 ID 的行数

Question

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)

这里是这个存储过程产生的截图：screenshot

我尝试使用 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？

提前感谢您的帮助。

Answer 1

您可以将您的声明包装在CTE 中，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