Sql中如何实现连续相同的数据只取第一条

[Alden]

例如：
Key Name Flag
1 1001 0
2 1002 1
3 1003 0
4 1004 0
5 1005 1
6 1006 1
7 1007 0
8 1008 0
9 1009 0
10 1010 1
11 1011 1
12 1012 1

希望的结果是
Key Name Flag
1 1001 0
3 1003 0
7 1007 0
谢谢

[昵称被占用了]

select * 
from tabname a
where not exists (
select 1 from tabname b
where b.key = a.key - 1
and b.flag = 0
)
and a.flag = 0

[唐诗三百首]

create table tab
(Keys int, name int, Flag int)

insert into tab
select 1, 1001, 0 union all
select 2, 1002, 1 union all
select 3, 1003, 0 union all
select 4, 1004, 0 union all
select 5, 1005, 1 union all
select 6, 1006, 1 union all
select 7, 1007, 0 union all
select 8, 1008, 0 union all
select 9, 1009, 0 union all
select 10, 1010, 1 union all
select 11, 1011, 1 union all
select 12, 1012, 1


with pl as
(select Keys,name,Flag,
keys-row_number() over(order by Keys) rn
from tab where Flag=0
)
select * 
from tab where keys in
(select min(Keys)
from pl group by rn)

Keys        name        Flag
----------- ----------- -----------
1           1001        0
3           1003        0
7           1007        0

(3 row(s) affected)

[Alden]

太棒了，二位兄弟

[苦苦的潜行者]

...
就当我秀下限了

create table t1([key] int,name int,flag int)
insert t1
select 1,	1001,	0 union all
select 2,	1002,	1 union all
select 3,	1003,	0 union all
select 4,	1004,	0 union all
select 5,	1005,	1 union all
select 6,	1006,	1 union all
select 7,	1007,	0 union all
select 8,	1008,	0 union all
select 9,	1009,	0 union all
select 10,	1010,	1 union all
select 11,	1011,	1 union all
select 12,	1012,	1
go
;with cte(id,[key],name,flag)
as
(
select ROW_NUMBER()over(order by [key]),* from t1
where flag=0
)
select top 1 [key] ,name,flag from  cte
union all
select b.[key],b.name,b.flag  from cte a,cte b
where a.id=b.id-1 and a.[key]<>b.[key] -1
/*
(3 行受影响)
key name   flag
--- ----   ---
1	1001	0
3	1003	0
7	1007	0
*/
go
drop table t1

[苦苦的潜行者]

[Quote=引用 2 楼 ap0405140 的回复:]
SQL code

create table tab
(Keys int, name int, Flag int)

insert into tab
select 1, 1001, 0 union all
select 2, 1002, 1 union all
select 3, 1003, 0 union all
select 4, 1004, 0 union all
select 5, 10……
[/Quote]

唐诗,方法真妙啊,如诗一般..
怪不得叫唐诗..