Question

如果表值参数为null，我想获取列的所有值，否则只获取匹配的记录。我试过这个但是当子查询返回多个记录时它会出错：

ALTER PROCEDURE [dbo].[usp_MY_SP]
(
    @TVP ABCTableType readonly,
)
AS

    SELECT *

    FROM TABLE t

    WHERE
        t.Id IN(
            CASE WHEN (SELECT COUNT([Id]) FROM @TVP) > 0 
                THEN (SELECT [Id] FROM @TVP)
                ELSE (t.Id)
            END
        )

Answer 1

你可以这样做

ALTER PROCEDURE [dbo].[usp_MY_SP]
(
    @TVP ABCTableType readonly
)
AS

      SELECT * FROM t
      WHERE
          ((SELECT COUNT([Id]) FROM @TVP) = 0)
          OR
          t.Id IN (SELECT [Id] FROM @TVP)

如果表值参数为null，则获取所有记录

1 个答案: