更新列问题
小弟不才 有以下两列：
lie1 lie2
A 0
A 0
A 0
B 0
B 0
B 0
B 0
C 0
C 0
D 0
D 0
D 0
E 0
如何更新成：
lie1 lie2
A 0
A 1
A 2
B 0
B 1
B 2
B 3
C 0
C 1
D 0
D 1
D 2
E 0
谢谢！各位！ C
[解决办法]
declare @table table (ie1 char(1),lie2 int)
insert into @table
select 'A',0 union all
select 'A',0 union all
select 'A',0 union all
select 'B',0 union all
select 'B',0 union all
select 'B',0 union all
select 'B',0 union all
select 'C',0 union all
select 'C',0 union all
select 'D',0 union all
select 'D',0 union all
select 'D',0 union all
select 'E',0
;
with a as
(
select *,ROW_NUMBER() OVER(PARTITION BY ie1 order by lie2) id from @table
)
update a set lie2=id-1
select * from @table
[解决办法]
尝试了一下用一条语句解决此问题，但没能成功。
[解决办法]
if object_id('Tempdb..#t') is not null drop table #t
create table #t(
id int identity(1,1) not null,
[lie1] nvarchar(100) null,
[lie2] int null
)
Insert Into #t
select 'A',0 union all
select 'A',0 union all
select 'A',0 union all
select 'B',0 union all
select 'B',0 union all
select 'B',0 union all
select 'B',0 union all
select 'C',0 union all
select 'C',0 union all
select 'D',0 union all
select 'D',0 union all
select 'D',0 union all
select 'E',0
-----更新
update #t set lie2=t.col-1 from (select id tid,ROW_NUMBER() OVER(PARTITION BY lie1 order by lie2) col from #t ) t where id=t.tid
---查询
select * from #t
---结果
id lie1 lie2
----------- ---------------------------------------------------------------- -----------
1 A 0
2 A 1
3 A 2
4 B 0
5 B 1
6 B 2
7 B 3
8 C 0
9 C 1
10 D 0
11 D 1
12 D 2
13 E 0
(13 行受影响)
while 1=1
begin
update top (1) t set lie2=t2.num+1
from @t t
join (select lie1,MAX(lie2) num from @t group by lie1) t2 on t.lie1=t2.lie1
join (select lie1,COUNT(*) cnt from @t where lie2=0 group by lie1) t3 on t.lie1=t3.lie1 and t3.cnt>1
where t.lie2=0
if @@ROWCOUNT=0 break
end
