问题描述：
有表tb, 如下:
id values
----------- -----------
1 aa,bb
2 aaa,bbb,ccc
欲按,分拆values列, 分拆后结果如下:
id value
----------- --------
1 aa
1 bb
2 aaa
2 bbb
2 ccc
1. 旧的解决方法
SELECT TOP 8000
id = IDENTITY(int, 1, 1)
INTO #
from syscolumns a, syscolumns b
SELECT
A.id,
SUBSTRING(A.[values], B.id, CHARINDEX(',', A.[values] + ',', B.id) - B.id)
from tb A, # B
WHERE SUBSTRING(',' + A.[values], B.id, 1) = ','
DROP TABLE #
-- 2. 新的解决方法
-- 示例数据
DECLARE @t TABLE(id int, [values] varchar(100))
INSERT @t SELECT 1, 'aa,bb'
UNION ALL SELECT 2, 'aaa,bbb,ccc'
-- 查询处理
SELECT
A.id, B.value
from(
SELECT id, [values] = CONVERT(xml,
'<root><v>' + REPLACE([values], ',', '</v><v>') + '</v></root>')
from @t
)A
OUTER APPLY(
SELECT value = N.v.value('.', 'varchar(100)')
from A.[values].nodes('/root/v') N(v)
)B
/*--结果
id value
----------- --------
1 aa
1 bb
2 aaa
2 &nbs
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