select a.* from tb a where 2>(select count(*) from tb where year=a.year and month=a.month and value1>a.value1) select a.* from tb a where value1 in (select top 2 value1 from tb where year=a.year and month=a.month order by value1 desc)可能手误
--取大. select a.* from tb a where 2 > (select count(*) from tb where year = a.year and month = a.month and value1 > a.value1 ) order by a.year , a.month --取小 select a.* from tb a where 2 > (select count(*) from tb where year = a.year and month = a.month and value1 < a.value1 ) order by a.year , a.month
--按某一字段分组取最大(小)值所在行的数据(2007-10-23于浙江杭州) /* 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 */
create table tb ([year] int, [month] char(2), value1 int, value2 int,value3 int) insert into tb values(2005, '03', 100 , 200 , 300 ) insert into tb values(2005, '03', 200 , 300 , 400 ) insert into tb values(2005, '03', 400 , 300 , 400 ) insert into tb values(2005, '04', 100 , 200 , 300 ) insert into tb values(2005, '04', 200 , 300 , 400 ) insert into tb values(2005, '04', 400 , 300 , 400 ) insert into tb values(2004, '03', 100 , 200 , 300 ) insert into tb values(2004, '03', 200 , 300 , 400 ) insert into tb values(2004, '03', 400 , 300 , 400 ) insert into tb values(2004, '04', 100 , 200 , 300 ) insert into tb values(2004, '04', 200 , 300 , 400 ) insert into tb values(2004, '04', 400 , 300 , 400 ) go--取大. select a.* from tb a where 2 > (select count(*) from tb where year = a.year and month = a.month and value1 > a.value1 ) order by a.year , a.month /* year month value1 value2 value3 ----------- ----- ----------- ----------- ----------- 2004 03 200 300 400 2004 03 400 300 400 2004 04 200 300 400 2004 04 400 300 400 2005 03 200 300 400 2005 03 400 300 400 2005 04 200 300 400 2005 04 400 300 400(所影响的行数为 8 行) */--取小 select a.* from tb a where 2 > (select count(*) from tb where year = a.year and month = a.month and value1 < a.value1 ) order by a.year , a.month /* year month value1 value2 value3 ----------- ----- ----------- ----------- ----------- 2004 03 100 200 300 2004 03 200 300 400 2004 04 100 200 300 2004 04 200 300 400 2005 03 100 200 300 2005 03 200 300 400 2005 04 100 200 300 2005 04 200 300 400(所影响的行数为 8 行)*/drop table tb
create table tb ([year] int, [month] char(2), value1 int, value2 int,value3 int) insert into tb values(2005, '03', 100 , 200 , 300 ) insert into tb values(2005, '03', 200 , 300 , 400 ) insert into tb values(2005, '03', 400 , 300 , 400 ) insert into tb values(2005, '04', 100 , 200 , 300 ) insert into tb values(2005, '04', 200 , 300 , 400 ) insert into tb values(2005, '04', 400 , 300 , 400 ) insert into tb values(2004, '03', 100 , 200 , 300 ) insert into tb values(2004, '03', 200 , 300 , 400 ) insert into tb values(2004, '03', 400 , 300 , 400 ) insert into tb values(2004, '04', 100 , 200 , 300 ) insert into tb values(2004, '04', 200 , 300 , 400 ) insert into tb values(2004, '04', 400 , 300 , 400 ) go--取大. select a.* from tb a where 2 > (select count(*) from tb where year = a.year and month = a.month and value1 > a.value1 ) order by a.year , a.month , a.value1 desc /* year month value1 value2 value3 ----------- ----- ----------- ----------- ----------- 2004 03 400 300 400 2004 03 200 300 400 2004 04 400 300 400 2004 04 200 300 400 2005 03 400 300 400 2005 03 200 300 400 2005 04 400 300 400 2005 04 200 300 400(所影响的行数为 8 行) */--取小 select a.* from tb a where 2 > (select count(*) from tb where year = a.year and month = a.month and value1 < a.value1 ) order by a.year , a.month , a.value1 /* year month value1 value2 value3 ----------- ----- ----------- ----------- ----------- 2004 03 100 200 300 2004 03 200 300 400 2004 04 100 200 300 2004 04 200 300 400 2005 03 100 200 300 2005 03 200 300 400 2005 04 100 200 300 2005 04 200 300 400(所影响的行数为 8 行)*/drop table tb
select a.* from tb a where value1 in (select top 2 value1 from tb where year=a.year and month=a.month order by value1 desc)可能手误
select a.* from tb a where 2 > (select count(*) from tb where year = a.year and month = a.month and value1 > a.value1 ) order by a.year , a.month
--取小
select a.* from tb a where 2 > (select count(*) from tb where year = a.year and month = a.month and value1 < a.value1 ) order by a.year , a.month
/*
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
*/
insert into tb values(2005, '03', 100 , 200 , 300 )
insert into tb values(2005, '03', 200 , 300 , 400 )
insert into tb values(2005, '03', 400 , 300 , 400 )
insert into tb values(2005, '04', 100 , 200 , 300 )
insert into tb values(2005, '04', 200 , 300 , 400 )
insert into tb values(2005, '04', 400 , 300 , 400 )
insert into tb values(2004, '03', 100 , 200 , 300 )
insert into tb values(2004, '03', 200 , 300 , 400 )
insert into tb values(2004, '03', 400 , 300 , 400 )
insert into tb values(2004, '04', 100 , 200 , 300 )
insert into tb values(2004, '04', 200 , 300 , 400 )
insert into tb values(2004, '04', 400 , 300 , 400 )
go--取大.
select a.* from tb a where 2 > (select count(*) from tb where year = a.year and month = a.month and value1 > a.value1 ) order by a.year , a.month
/*
year month value1 value2 value3
----------- ----- ----------- ----------- -----------
2004 03 200 300 400
2004 03 400 300 400
2004 04 200 300 400
2004 04 400 300 400
2005 03 200 300 400
2005 03 400 300 400
2005 04 200 300 400
2005 04 400 300 400(所影响的行数为 8 行)
*/--取小
select a.* from tb a where 2 > (select count(*) from tb where year = a.year and month = a.month and value1 < a.value1 ) order by a.year , a.month
/*
year month value1 value2 value3
----------- ----- ----------- ----------- -----------
2004 03 100 200 300
2004 03 200 300 400
2004 04 100 200 300
2004 04 200 300 400
2005 03 100 200 300
2005 03 200 300 400
2005 04 100 200 300
2005 04 200 300 400(所影响的行数为 8 行)*/drop table tb
insert into tb values(2005, '03', 100 , 200 , 300 )
insert into tb values(2005, '03', 200 , 300 , 400 )
insert into tb values(2005, '03', 400 , 300 , 400 )
insert into tb values(2005, '04', 100 , 200 , 300 )
insert into tb values(2005, '04', 200 , 300 , 400 )
insert into tb values(2005, '04', 400 , 300 , 400 )
insert into tb values(2004, '03', 100 , 200 , 300 )
insert into tb values(2004, '03', 200 , 300 , 400 )
insert into tb values(2004, '03', 400 , 300 , 400 )
insert into tb values(2004, '04', 100 , 200 , 300 )
insert into tb values(2004, '04', 200 , 300 , 400 )
insert into tb values(2004, '04', 400 , 300 , 400 )
go--取大.
select a.* from tb a where 2 > (select count(*) from tb where year = a.year and month = a.month and value1 > a.value1 ) order by a.year , a.month , a.value1 desc
/*
year month value1 value2 value3
----------- ----- ----------- ----------- -----------
2004 03 400 300 400
2004 03 200 300 400
2004 04 400 300 400
2004 04 200 300 400
2005 03 400 300 400
2005 03 200 300 400
2005 04 400 300 400
2005 04 200 300 400(所影响的行数为 8 行)
*/--取小
select a.* from tb a where 2 > (select count(*) from tb where year = a.year and month = a.month and value1 < a.value1 ) order by a.year , a.month , a.value1
/*
year month value1 value2 value3
----------- ----- ----------- ----------- -----------
2004 03 100 200 300
2004 03 200 300 400
2004 04 100 200 300
2004 04 200 300 400
2005 03 100 200 300
2005 03 200 300 400
2005 04 100 200 300
2005 04 200 300 400(所影响的行数为 8 行)*/drop table tb