Question

我试图将每个案例的行数限制为仅5行。有些情况只有1或2行，但有些只有15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)

以下是此存储过程生成的屏幕截图：screenshot

我试过使用where子句但是它不允许我在where子句之后放置一个窗口函数。它也无法识别我的“行”别名。

有没有其他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

您可以将自己的陈述用CTE包裹，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

限制每个ID的行数

1 个答案: