存储过程位参数激活附加where子句以检查null

我有一个存储过程,如下所示:

CREATE PROCEDURE dbo.usp_TestFilter
  @AdditionalFilter BIT = 1
AS
  SELECT *
  FROM dbo.SomeTable T
  WHERE
    T.Column1 IS NOT NULL
    AND CASE WHEN @AdditionalFilter = 1 THEN
      T.Column2 IS NOT NULL

不用说,这不起作用.如何激活检查@AdditionalFilter参数的附加where子句？谢谢你的帮助.

CREATE PROCEDURE dbo.usp_TestFilter
  @AdditionalFilter BIT = 1
AS
  SELECT *
  FROM dbo.SomeTable T
  WHERE
    T.Column1 IS NOT NULL
    AND (@AdditionalFilter = 0 OR
      T.Column2 IS NOT NULL)

如果@AdditionalFilter为0,则不会评估该列,因为它不会影响括号之间部分的结果.如果它不是0,则将评估列条件.