sql-server - 在 SET 和 JOIN 子句中使用 TVP 名称

Question

我在 SQL Server 2008 R2 中需要传入许多行以更新许多行。我决定尝试使用表值参数来完成此任务。首先 - 我在服务器上创建了类型。

CREATE TYPE [dbo].[crm_question_idx_type] AS TABLE(
    [survey_question_id] [int] NOT NULL,
    [row_index] [int] NOT NULL,
     PRIMARY KEY (survey_question_id)
)
GO

一切顺利，但在尝试创建存储过程以使用新类型时出现了问题。创建新过程的代码是:

CREATE PROCEDURE dbo.crm_question_index_update
(
@question_idx dbo.crm_question_idx_type READONLY
)
AS

SET NOCOUNT ON

UPDATE crm_survey_question 
SET crm_survey_question.row_index = @question_idx.row_index
FROM crm_survey_question 
INNER JOIN @question_idx 
    ON crm_survey_question.survey_question_id =  @question_idx.survey_question_id

当我尝试在服务器上编译它时，出现以下错误:

Msg 137, Level 16, State 1, Procedure crm_question_index_update, Line 10
Must declare the scalar variable "@question_idx".

现在在我的代码中 @question_idx 是 dbo.crm_question_idx 类型的输入参数，所以我无法理解为什么会弹出此错误。

Answer 1

别名是你的 friend 。在这种情况下，它们不仅简化了代码量，而且在引用表变量或 TVP 时也需要它们。

UPDATE c
  SET c.row_index = q.row_index
  FROM dbo.crm_survey_question AS c
  INNER JOIN @question_idx AS q
  ON c.survey_question_id = q.survey_question_id;