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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