如何從變量設置ASC/DESC的順序

Question

我在嘗試按列索引（數值）使用Order By時出現問題。

這個工程：

@OrderBy = 1 

    SELECT Col1,Col2 FROM Table ORDER BY @OrderBy ASC 

這不起作用：

@OrderBy = 1 
    @Direction = 'ASC' 

    SELECT Col1,Col2 FROM Table ORDER BY @OrderBy @Direction 

如何通過數字列數訂貨時按方向使用順序變量？

Answer 1

ORDER BY 
    case when @Direction = 'ASC' THEN field END ASC , 
    case when @Direction = 'DESC' THEN field END DESC 

Answer 2

試試這個：

ORDER BY @OrderBy CASE @Direction WHEN 'ASC' THEN @OrderBy ELSE -@OrderBy END ASC