SQL Server对多列进行动态排序

Question

我有一个使用动态排序的存储过程，2个参数确定排序-列： @SortIndex和排序方向： @SortDirection

相关代码：

...
ROW_NUMBER() OVER
            (
            ORDER BY
            --  string order by
            CASE @SortDirection
                  WHEN 'ASC'  THEN
                    CASE @SortIndex
                      WHEN 1 THEN SKU
                      WHEN 2 THEN BrandName
                      WHEN 3 THEN ItemName
                    END            
                END ASC,
                CASE @SortDirection
                  WHEN 'DESC' THEN
                    CASE @SortIndex
                      WHEN 1 THEN SKU
                      WHEN 2 THEN BrandName
                      WHEN 3 THEN ItemName
                    END
                END DESC,

这对单列进行排序，但是当@SortIndex为2时，我想对@SortIndex BrandName ASC, ItemName ASC ， @SortIndex BrandName ASC, ItemName ASC进行排序。

Answer 1

如果无法使用动态SQL，则唯一的方法是列出ASC和DESC所有可能组合

例如：

ORDER By
CASE WHEN @SortIndex = '1' AND @SortDirection = 'ASC' THEN SKU END,
CASE WHEN @SortIndex = '1' AND @SortDirection = 'DESC' THEN SKU END DESC,
CASE WHEN @SortIndex = '2' AND @SortDirection = 'ASC' THEN BrandName END,
CASE WHEN @SortIndex = '2' AND @SortDirection = 'DESC' THEN BrandName END DESC,
--and so on...

Answer 2

ROW_NUMBER() OVER
            (
            ORDER BY
            --  string order by
            CASE @SortDirection
                  WHEN 'ASC'  THEN
                    CASE @SortIndex
                      WHEN 1 THEN SKU
                      WHEN 2 THEN BrandName + ',' + ItemName 
                      WHEN 3 THEN ItemName
                    END            
                END ASC,
                CASE @SortDirection
                  WHEN 'DESC' THEN
                    CASE @SortIndex
                      WHEN 1 THEN SKU
                      WHEN 2 THEN BrandName + ',' + ItemName
                      WHEN 3 THEN ItemName
                    END
                END DESC,

在“当2子句”中使用Brandname + ItemName并在排序中使用两个字段。

Answer 3

普遍性的样本.... K.AryaeeMoeen

---------------------------------------------------
SELECT 1 AS Num, '2015-06-22' AS Datex INTO Arya
INSERT INTO Arya 
SELECT 2, '2015-08-17' UNION SELECT 3, '2015-07-14'
---------------------------------------------------
Now, Dynamic sorting(Base on Datex Field) in a SELECTION ....
---------------------------------------------------
SELECT Num, Date1 FROM ARYA, (SELECT -1 as e union Select 1 as e) a
WHERE a.e=-1  --(OR a.e=1) For Dynamic Sort
ORDER BY DATEDIFF(DAY, '2000-01-01', Arya.Datex)*sign(a.e)
---------------------------------------------------