sql将字符串拆分为一行

Question

declare @sqlstr varchar(max);
select @sqlstr = 'a,b,c,d,e,f';

我想在sql server2008中使用一条sql语句来处理一行六列。

a,b,c,d,e,f

Answer 1

如果您可以将其声明为nvarchar(MAX)而不是varchar(max)，您可以尝试将其转换为动态sql。例如:

declare @sqlstr nvarchar(max); 
--Select the initial values
select @sqlstr = 'a,b,c,d,e,f';
--Replace the comma so the string becomes a','b','c','d','e','f
select @sqlstr = REPLACE(@sqlstr, ',', ''',''')
--Add select to the beginning and add leading and trailing ' around the select values
select @sqlstr = 'Select ''' + @sqlstr + ''''
--execute the dynamic sql of select 'a','b','c','d','e','f'
exec sp_executesql @sqlstr

也可以稍微缩写

declare @sqlstr nvarchar(max); 
--Select the initial values
select @sqlstr = 'a,b,c,d,e,f';
--Build the sql statement
select @sqlstr = 'Select ''' + REPLACE(@sqlstr, ',', ''',''') + ''''
--execute the dynamic sql of select 'a','b','c','d','e','f'
exec sp_executesql @sqlstr

或者如果您被束缚于 VARCHAR(MAX)

DECLARE @sqlstr VARCHAR(MAX)
--Select the initial values
SELECT @sqlstr = 'a,b,c,d,e,f';
--Build the sql statement
DECLARE @DynamicSQL NVARCHAR(MAX) = 'Select ''' + REPLACE(@sqlstr, ',', ''',''') + ''''
--execute the dynamic sql of select 'a','b','c','d','e','f'
EXEC sp_executesql @DynamicSQL

请参阅Sql Fiddle示例