表格如下: id seq kid num
01 1 22
02 2 22
03 2 22
04 4 22
05 5 22
06 6 22
.. ..
96 96 22
97 96 22
98 96 22
99 96 22
100 100 22 01 1 33
02 2 33
08 3 33
14 4 33
25 5 33
06 6 33
.. ..
16 96 33
27 97 33
38 98 33
39 99 33
80 99 33其中,kid相同且seq并列的ID,保留其名次. 希望得到如下结果 最小的5条记录
01 1 22
02 2 22
03 2 22
04 4 22
05 5 22
01 1 33
02 2 33
08 3 33
14 4 33
25 5 33最大的5条记录
96 96 22
97 96 22
98 96 22
99 96 22
100 100 22
16 96 33
27 97 33
38 98 33
39 99 33
80 99 33
01 1 22
02 2 22
03 2 22
04 4 22
05 5 22
06 6 22
.. ..
96 96 22
97 96 22
98 96 22
99 96 22
100 100 22 01 1 33
02 2 33
08 3 33
14 4 33
25 5 33
06 6 33
.. ..
16 96 33
27 97 33
38 98 33
39 99 33
80 99 33其中,kid相同且seq并列的ID,保留其名次. 希望得到如下结果 最小的5条记录
01 1 22
02 2 22
03 2 22
04 4 22
05 5 22
01 1 33
02 2 33
08 3 33
14 4 33
25 5 33最大的5条记录
96 96 22
97 96 22
98 96 22
99 96 22
100 100 22
16 96 33
27 97 33
38 98 33
39 99 33
80 99 33
select * from table1 t where
exists(select 1 from table1 where seq=t.seq and kid=kid and ID<>t.ID)
insert @T select '01', 1 , 22
insert @T select '02', 2 , 22
insert @T select '03', 2 , 22
insert @T select '04', 4 , 22
insert @T select '05', 5 , 22
insert @T select '06', 6 , 22 insert @T select '96', 96 , 22
insert @T select '97', 96 , 22
insert @T select '98', 96 , 22
insert @T select '99', 96 , 22
insert @T select '100', 100, 22 insert @T select '01', 1, 33
insert @T select '02', 2, 33
insert @T select '08', 3, 33
insert @T select '14', 4, 33
insert @T select '25', 5, 33
insert @T select '06', 6, 33 insert @T select '16', 96, 33
insert @T select '27', 97, 33
insert @T select '38', 98, 33
insert @T select '39', 99, 33
insert @T select '80', 99, 33
select * from @t t where (select count(1) from @t where kid=t.kid and seq<t.seq)<5
union all
select * from @t t where (select count(1) from @t where kid=t.kid and seq>t.seq)<5id seq kid
----- ----------- -----------
01 1 22
02 2 22
03 2 22
04 4 22
05 5 22
01 1 33
02 2 33
08 3 33
14 4 33
25 5 33
96 96 22
97 96 22
98 96 22
99 96 22
100 100 22
16 96 33
27 97 33
38 98 33
39 99 33
80 99 33
--2007-10-23于杭州
/*
数据如下:
name val memo
a 2 a2(a的第二个值)
a 1 a1--a的第一个值
a 3 a3:a的第三个值
b 1 b1--b的第一个值
b 3 b3:b的第三个值
b 2 b2b2b2b2
b 4 b4b4
b 5 b5b5b5b5b5
*/
--创建表并插入数据:
create table tb(name varchar(10),val int,memo varchar(20))
insert into tb values('a', 2, 'a2(a的第二个值)')
insert into tb values('a', 1, 'a1--a的第一个值')
insert into tb values('a', 3, 'a3:a的第三个值')
insert into tb values('b', 1, 'b1--b的第一个值')
insert into tb values('b', 3, 'b3:b的第三个值')
insert into tb values('b', 2, 'b2b2b2b2')
insert into tb values('b', 4, 'b4b4')
insert into tb values('b', 5, 'b5b5b5b5b5')
go--一、按name分组取val最大的值所在行的数据。
--方法1:
select a.* from tb a where val = (select max(val) from tb where name = a.name) order by a.name
--方法2:
select a.* from tb a where not exists(select 1 from tb where name = a.name and val > a.val)
--方法3:
select a.* from tb a,(select name,max(val) val from tb group by name) b where a.name = b.name and a.val = b.val order by a.name
--方法4:
select a.* from tb a inner join (select name , max(val) val from tb group by name) b on a.name = b.name and a.val = b.val order by a.name
--方法5
select a.* from tb a where 1 > (select count(*) from tb where name = a.name and val > a.val ) order by a.name
/*
name val memo
---------- ----------- --------------------
a 3 a3:a的第三个值
b 5 b5b5b5b5b5
*/--二、按name分组取val最小的值所在行的数据。
--方法1:
select a.* from tb a where val = (select min(val) from tb where name = a.name) order by a.name
--方法2:
select a.* from tb a where not exists(select 1 from tb where name = a.name and val < a.val)
--方法3:
select a.* from tb a,(select name,min(val) val from tb group by name) b where a.name = b.name and a.val = b.val order by a.name
--方法4:
select a.* from tb a inner join (select name , min(val) val from tb group by name) b on a.name = b.name and a.val = b.val order by a.name
--方法5
select a.* from tb a where 1 > (select count(*) from tb where name = a.name and val < a.val) order by a.name
/*
name val memo
---------- ----------- --------------------
a 1 a1--a的第一个值
b 1 b1--b的第一个值
*/--三、按name分组取第一次出现的行所在的数据。
select a.* from tb a where val = (select top 1 val from tb where name = a.name) order by a.name
/*
name val memo
---------- ----------- --------------------
a 2 a2(a的第二个值)
b 1 b1--b的第一个值
*/--四、按name分组随机取一条数据。
select a.* from tb a where val = (select top 1 val from tb where name = a.name order by newid()) order by a.name
/*
name val memo
---------- ----------- --------------------
a 1 a1--a的第一个值
b 5 b5b5b5b5b5
*/--五、按name分组取最小的两个(N个)val
select a.* from tb a where 2 > (select count(*) from tb where name = a.name and val < a.val ) order by a.name,a.val
select a.* from tb a where val in (select top 2 val from tb where name=a.name order by val) order by a.name,a.val
select a.* from tb a where exists (select count(*) from tb where name = a.name and val < a.val having Count(*) < 2) order by a.name
/*
name val memo
---------- ----------- --------------------
a 1 a1--a的第一个值
a 2 a2(a的第二个值)
b 1 b1--b的第一个值
b 2 b2b2b2b2
*/--六、按name分组取最大的两个(N个)val
select a.* from tb a where 2 > (select count(*) from tb where name = a.name and val > a.val ) order by a.name,a.val
select a.* from tb a where val in (select top 2 val from tb where name=a.name order by val desc) order by a.name,a.val
select a.* from tb a where exists (select count(*) from tb where name = a.name and val > a.val having Count(*) < 2) order by a.name
/*
name val memo
---------- ----------- --------------------
a 2 a2(a的第二个值)
a 3 a3:a的第三个值
b 4 b4b4
b 5 b5b5b5b5b5
*/