如果表值參數爲空，則獲取所有記錄

Question

如果表值參數爲空，我想獲取所有列值，否則只有匹配的記錄。我曾經試過，但在子查詢返回多個記錄它給出了一個錯誤：

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

你能做到這樣

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)