table
num createdate
---------------------------------
(空) 20090901
(空) 20090901
(空) 20090902
(空) 20090902
(空) 20090903
(空) 20090903
---------------------------------
現在要通過createdate來產生乙個流水號(4位) 按當天來生成 換天要重新生成
即得到結果如下:
table
num createdate
---------------------------------
200909010001 20090901
200909010002 20090901
200909020001 20090902
200909020002 20090902
200909030001 20090903
200909030002 20090903
---------------------------------
create
table
tb(id
int, num
varchar(12
),createdate
varchar(8
))insert
into
tb values(1
,'','
20090901')
insert
into
tb values(2
,'','
20090901')
insert
into
tb values(3
,'','
20090902')
insert
into
tb values(4
,'','
20090902')
insert
into
tb values(5
,'','
20090903')
insert
into
tb values(6
,'','
20090903')
goupdate
tb set
num
=createdate
+right('
000'
+cast
((select
count(1
) from
tb where
createdate
=t.createdate
andid
<
t.id) +1
asvarchar),4
) from
tb t
select
*from
tbdrop
table
tb/*
id num createdate
----------- ------------ ----------
1 200909010001 20090901
2 200909010002 20090901
3 200909020001 20090902
4 200909020002 20090902
5 200909030001 20090903
6 200909030002 20090903
（所影響的行數為 6 行）*/
declare
@tb1
table([
createdate
]datetime
)insert
@tb1
select
'20090901
'union
allselect
'20090901
'union
allselect
'20090902
'union
allselect
'20090902
'union
allselect
'20090903
'union
allselect
'20090903'--
sql 2005
select
convert
(nvarchar(20
),[createdate],
112) as[
createdate],
convert
(nvarchar(20
),[createdate],
112)
+right('
0000'+
cast
(row_number()
over
(partition by[
createdate
]orderby[
createdate])
asnvarchar(10
)),4
) as
numfrom
@tb1
--sql2000
select
identity
(int,1
,1) as
id,[
createdate
]into
#tem
from
@tb1
select
convert
(nvarchar(20
),[createdate],
112) as[
createdate],
convert
(nvarchar(20
),[createdate],
112)
+right('
0000'+
cast
((select
count(1
) from
#tem
wheret.[
createdate]=
[createdate
]and
t.id
>
id)+1as
nvarchar(10
)),4
) as
numfrom
#tem t
drop
table
#tem
--測試結果:
/*createdate num
-------------------- ------------------------
20090901 200909010001
20090901 200909010002
20090902 200909020001
20090902 200909020002
20090903 200909030001
20090903 200909030002
(6 row(s) affected)
*/
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