根据生成的随机数对结果集进行排名

Question

我有一个 T-Sql 查询，它为每条记录生成一个随机数。我还想做的是添加 Rank 或 Row_Number 列

我已经尝试了 Rank 和 Row_Number，但是当我在 order by 子句中放入 int 时出现以下错误：

窗口函数、聚合和 NEXT VALUE FOR 函数不 支持整数索引作为 ORDER BY 子句表达式

SELECT      TOP(4) PERCENT  CONVERT(VARCHAR(10),Getdate(),103) RunDate
        , EM.EmpCode 'Emp Code'
        , D.DepotDepotDescription 'Depot'
        , cast(rand(checksum(newid())) * 10 as decimal(8, 6)) [Random Number]
        , rank() OVER (order by 100) Row
FROM        ttimport.EmployeeMaster EM 
        LEFT OUTER JOIN ttimport.PayrollFrequency PF ON EM.FrequencyDesc = PF.DescCode
        LEFT OUTER JOIN ttimport.Departments DPT ON EM.DepartmentName = DPT.DescCode
        LEFT OUTER JOIN ttimport.Depot D ON EM.DepotDepotDescription = D.DescCode

ORDER BY 4

Answer 1

哦，我想我明白你的问题出在哪里了。我假设您想根据[Random Number] 值来rank？如果是这样，请继续阅读！

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您不能在 order by 中使用常量并期望它以任何方式排序，这就是您当前脚本抛出错误的原因，因为 rank 需要排序顺序。

要引用您的 Random Number 列，您只需将其包装在另一个 select 或使用 cte 到同一端：

WITH data AS
(

    SELECT      TOP(4) PERCENT  CONVERT(VARCHAR(10),Getdate(),103) RunDate
            , EM.EmpCode 'Emp Code'
            , D.DepotDepotDescription 'Depot'
            , cast(rand(checksum(newid())) * 10 as decimal(8, 6)) [Random Number]
    FROM        ttimport.EmployeeMaster EM 
            LEFT OUTER JOIN ttimport.PayrollFrequency PF ON EM.FrequencyDesc = PF.DescCode
            LEFT OUTER JOIN ttimport.Departments DPT ON EM.DepartmentName = DPT.DescCode
            LEFT OUTER JOIN ttimport.Depot D ON EM.DepotDepotDescription = D.DescCode
)
SELECT *
      , RANK() OVER (ORDER BY [Random Number]) AS Ranking
FROM data
ORDER BY 4