一种执行此操作的方法是在不同级别定义列别名，以便您可以两次引用它而不用重复该表达式。
SELECT *,
Row_number() OVER (ORDER BY
CASE WHEN @SortBy LIKE '% ASC' THEN sort_col END ASC,
CASE WHEN @SortBy LIKE '% DESC' THEN sort_col END DESC) AS RowNumber
FROM YourTable
CROSS APPLY (SELECT CASE
WHEN @SortBy LIKE 'column1 %' THEN Cast(column1 AS sql_VARIANT)
WHEN @SortBy LIKE 'column2 %' THEN Cast(column2 AS sql_VARIANT)
WHEN @SortBy LIKE 'column3 %' THEN Cast(column3 AS sql_VARIANT)
WHEN @SortBy LIKE 'column4 %' THEN Cast(column4 AS sql_VARIANT)
END) C(sort_col)
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