Question

想知道SQL Server中的一个简单SQL概念。我有两个表，基于某些IF条件，我想更新并插入来自不同表的数据。我正在使用下面的查询来存储过程。

IF( SELECT COUNT(colname) FROM [dbo].[Table_BKP] WHERE colname LIKE ('%Dear(DEC''D)444-0292/555-4528C%'))> 0 
BEGIN   
 ;WITH Dear AS 
(
SELECT ID,colname,SUBSTRING(colname,PATINDEX('%(DEC''D)%',colname),LEN(colname)-1) AS colname_4SUPPL,LEFT(colname,PATINDEX('%(DEC''D)%',colname)-1) AS colname_4MAIN
FROM [dbo].[Table_BKP] WHERE RTRIM(LTRIM(colname)) LIKE ('Dear(DEC''D)444-0292/555-4528C')
) SELECT * INTO Dear_ FROM Dear

 UPDATE A SET A.colname = B.colname_4MAIN FROM Table AS A INNER JOIN 
  Dear_ AS B ON A.ID = B.ID 
  INSERT INTO Table_SUPPL(ID,colnameMSC,[SOURCE],[TARGET])
 SELECT ID,replace(colname_4SUPPL,'(DEC''D)',''),'colname','colnameMSC' 
 FROM Dear_ 
END

更新语句工作正常，数据已更新到所需的表中。但是，数据未插入到所需的表中。

但是，当我改变下面的顺序时，它运作得很好。

IF( SELECT COUNT(colname) FROM [dbo].[Table_BKP] WHERE colname LIKE ('%Dear(DEC''D)444-0292/555-4528C%'))> 0 
     BEGIN  
   ;WITH Dear AS 
(
SELECT ID,colname,SUBSTRING(colname,PATINDEX('%(DEC''D)%',colname),LEN(colname)-1) AS colname_4SUPPL,LEFT(colname,PATINDEX('%(DEC''D)%',colname)-1) AS colname_4MAIN
FROM [dbo].[Table_BKP] WHERE RTRIM(LTRIM(colname)) LIKE ('Dear(DEC''D)444-0292/555-4528C')
) SELECT * INTO Dear_ FROM Dear

   INSERT INTO Table_SUPPL(ID,colnameMSC,[SOURCE],[TARGET]) SELECT 
   ID,replace(colname_4SUPPL,'(DEC''D)',''),'colname','colnameMSC' FROM 
  Dear_ 
  UPDATE A SET A.colname = B.colname_4MAIN FROM Table AS A INNER JOIN 
Dear_ AS B ON A.ID = B.ID 

END

为什么，formar问题没有按预期工作？而且，后一个[改变sequesnce之后（第一次INSERT然后更新）];它的工作完美...... SQL Server如何管理这些序列？任何人都可以澄清这个简单的疑问吗？感谢。

INSERT和UPDATE如何根据IF条件工作？

0 个答案: