sql – 如何在ROW_NUMBER()OVER(ORDER BY子句)中对datetime进行排序

2019年8月4日 202次阅读

嗨,下面的查询是一个更大的复杂查询的原型

问题是我应该能够根据用户输入以任何顺序(即ASC和DESC)对任何列进行排序.

CREATE table #Table1(
Name varchar(10) PRIMARY key,
DOB DateTime,
Rate numeric(10,2)  
)

INSERT INTO #Table1 (Name,DOB,Rate) values ('Name1','2/2/2012',10.23)
INSERT INTO #Table1 (Name,DOB,Rate) values ('Name2','3/2/2012',120.23)
INSERT INTO #Table1 (Name,DOB,Rate) values ('Name3','4/2/2012',110.23)
INSERT INTO #Table1 (Name,DOB,Rate) values ('Name4','5/2/2012',140.23)
INSERT INTO #Table1 (Name,DOB,Rate) values ('Name15','6/2/2012',130.23)
INSERT INTO #Table1 (Name,DOB,Rate) values ('Name6','2/21/2012',1120.23)

Declare @SortColumn varchar(10)
DECLARE @SortExpression varchar (10)

SET @SortColumn = 'DOB'
SET @SortExpression = 'DESC' -- Need to sort in both ASC and DESC

Select 
            Name,
            DOB,
            Rate,
            ROW_NUMBER() OVER 
                (ORDER BY 
                    CASE WHEN @SortColumn = 'Name' then Name
                         WHEN @SortColumn = 'DOB' THEN DOB
                         WHEN @SortColumn = 'Rate' THEN Rate
                    END  +  @SortExpression 
                ) AS RowNumber  
                FROM 
                #Table1

最佳答案 看起来您需要CAST()和CONVERT()CASE中的项目才能使其工作：

Declare @SortColumn varchar(10)
DECLARE @SortExpression varchar (10)

SET @SortColumn = 'DOB'
SET @SortExpression = 'DESC' -- Need to sort in both ASC and DESC

Select 
   Name,
   DOB,
   Rate,
   ROW_NUMBER() OVER 
   (ORDER BY 
       CASE WHEN @SortColumn = 'Name' then Name
            WHEN @SortColumn = 'DOB' THEN convert(char(10), DOB, 120)
            WHEN @SortColumn = 'Rate' THEN Cast(Rate as varchar(10))
       END  ASC
    ) AS RowNumberASC,
    ROW_NUMBER() OVER 
    (ORDER BY 
       CASE WHEN @SortColumn = 'Name' then Name
            WHEN @SortColumn = 'DOB' THEN convert(char(10), DOB, 120)
            WHEN @SortColumn = 'Rate' THEN Cast(Rate as varchar(10))
      END DESC
    ) AS RowNumberDESC
FROM Table1

见SQL Fiddle with Demo

正如@Martin指出ASC,DESC无法参数化.

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