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/*
表的结构:
year_month card_id rest_days
2004-01 0100001 01,07,09,14
2004-01 0100002 01,07,12,21
2004-01 0100003 01,04,13,29
....................................................
2004_04 0100001 01,07,09,14
2004_04 0100002 12,07,12,21
2004_04 0100003 21,04,13,29
*/
declare @a table(year_month varchar(10),card_id varchar(10),rest_days varchar(20))
insert @a select '2004-01','0100001','01,07,09,14'
union all select '2004-01','0100002','01,07,12,21'
union all select '2004-01','0100003','01,04,13,29'
union all select '2004_04','0100001','01,07,09,14'
union all select '2004_04','0100002','12,07,12,21'
union all select '2004_04','0100003','21,04,13,29'
select card_id,year_month+'-'+substring(rest_days,N,charindex(',',rest_days +',',N)-N) as d
from @a a,
(select 1 as N
union all select 2
union all select 3
union all select 4
union all select 5
union all select 6
union all select 7
union all select 8
union all select 9
union all select 10
union all select 11) b
where substring(','+rest_days,N,1)= ','
order by card_id,N
/*
card_id d
---------- -------------------------------
0100001 2004-01-01
0100001 2004_04-01
0100001 2004_04-07
0100001 2004-01-07
0100001 2004-01-09
0100001 2004_04-09
0100001 2004_04-14
0100001 2004-01-14
0100002 2004-01-01
0100002 2004_04-12
0100002 2004_04-07
0100002 2004-01-07
0100002 2004-01-12
0100002 2004_04-12
0100002 2004_04-21
0100002 2004-01-21
0100003 2004-01-01
0100003 2004_04-21
0100003 2004_04-04
0100003 2004-01-04
0100003 2004-01-13
0100003 2004_04-13
0100003 2004_04-29
0100003 2004-01-29
(所影响的行数为 24 行)
*/