SQL Server 字符串拼接与拆分 string varchar Split and Join

1、 Split    SQL Server 2008 新语法：

   
   
   

    
    
    
 DECLARE @str VARCHAR(MAX)
    
    
    
 SET @str = REPLACE(@teeIDs, ',', '''),(''')
    
    
    
 SET @str = 'SELECT * FROM (VALUES(''' + @str + ''')) AS V(A)' 
    
    
    
 EXEC (@str)
   
   
   

据说这个SQL语法是SQL Server 2008的。

    
    
    

     
     
     
SELECT * FROM (VALUES(1),(2),(3)) AS V(A)
    
    
    

配合个临时表，用起来还算方便。

   
   
   

    
    
    
INSERT INTO #TMP
    
    
    
EXEC (@sql)
   
   
   

2、 Split    兼容老的SQL Server的语法 （推荐）：

   
   
   

    
    
    
DECLARE @s VARCHAR(100) ,
    
    
    
 @sql VARCHAR(1000)
    
    
    
SET @s = '1,2,3,4,5,6,7,8,9,10'
    
    
    
SET @sql = 'select col=''' + REPLACE(@s, ',', ''' union select ''')
    
    
    
 + ''''
    
    
    
PRINT @sql
    
    
    
EXEC (@sql)
    
    
    
-- CORE SQL:
    
    
    
--EXEC ( 'select col=''' + REPLACE(@s, ',', ''' union select ''') )
   
   
   

3、 Join  FOR XML PATH('')  观察下面三个SQL的查询结果的变化即可

 

   
   
   

    
    
    
SELECT UserName='admin' UNION SELECT 'test' UNION SELECT 'abc'
    
    
    
SELECT ',' + UserName FROM ( SELECT UserName='admin' UNION SELECT 'test' UNION SELECT 'abc') A FOR XML PATH('')
    
    
    
SELECT stuff( (SELECT ',' + UserName FROM ( SELECT UserName='admin' UNION SELECT 'test' UNION SELECT 'abc') A FOR XML PATH(''))
    
    
    
 ,1,1,'')
   
   
   

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