取出数据

[liyouli_love_22]

PerformanaccessID empID manID MakingDate
1 117 113 2008-5-10 8:57:30
1 117 24 2008-5-11 9:57:30

SQL语句：
select distinct EmpID,manID from KhTbwDoingPerAccessRecord where 1=1 and MarkingDate between '06 1 2008 12:00AM' and '06 30 2008 12:00AM' AND EmpID= 117 group by EmpID,manID
结果：
empID manID
117 24
117 113

现在我要取出一个manID（MakingDate大一点的），该怎么做？

[一品梅]

select top 1                    order by ...;

[XJQ_1]

select top 1 EmpID,manID from KhTbwDoingPerAccessRecord where 1=1 and MarkingDate between '06 1 2008 12:00AM' and '06 30 2008 12:00AM' AND EmpID=117
group by EmpID,manID order by manID,MakingDate

[syc958]

select top 1 manID from table order by MakingDate desc;

[jinjin666]

select top 1 order by ...;

[conan304]

[Quote=引用楼主 liyouli_love_22 的帖子:]
PerformanaccessID empID manID MakingDate
1 117 113 2008-5-10 8:57:30
1 117 24 2008-5-11 9:57:30

SQL语句：
select distinct EmpID,manID from KhTbwDoingPerAccessRecord where 1=1 and MarkingDate between '06 1 2008 12:00AM' and '06 30 2008 12:00AM' AND EmpID= 117 group by EmpID,manID
结果：
empID manID
117 24
117 113

现在我要…
[/Quote]

select empid,manID
from KhTbwDoingPerAccessRecord k
where 1=1 and MarkingDate between '06  1 2008 12:00AM' and '06 30 2008 12:00AM'
and not exists(select 1 from KhTbwDoingPerAccessRecord where MarkingDate<k.MarkingDate)

[conan304]

select empid,manID
from KhTbwDoingPerAccessRecord k
where MarkingDate between '06  1 2008 12:00AM' and '06 30 2008 12:00AM'
and not exists(select 1 from KhTbwDoingPerAccessRecord where MarkingDate<k.MarkingDate)

[liyouli_love_22]

PerformanaccessID empID manID MakingDate
1 117 113 2008-5-10 8:57:30
1 117 24 2008-5-11 9:57:30
1 116 113 2008-5-11 9:57:31

当我在没有指定EmpID=117的时候，要把 116、117同时显示出来。怎么做呢？
即：
select distinct EmpID,manID from KhTbwDoingPerAccessRecord where 1=1 group by EmpID,manID
要得到的结果：
empID manID
117 24
116 113

[小明aa]

select EmpID,max(manID) as manID from KhTbwDoingPerAccessRecord where 1=1 and MarkingDate between '06 1 2008 12:00AM' and '06 30 2008 12:00AM' AND EmpID= 117 group by EmpID,manID

[liyouli_love_22]

不行啊

[confei]

实在不理解LZ为啥把逻辑简单的东东写的这么复杂。

[liyouli_love_22]

客户的需要阿

[大自然D使者]

[Quote=引用楼主 liyouli_love_22 的帖子:]
PerformanaccessID empID manID MakingDate
1 117 113 2008-5-10 8:57:30
1 117 24 2008-5-11 9:57:30

SQL语句：
select distinct EmpID,max（manID） from KhTbwDoingPerAccessRecord where 1=1 and MarkingDate between '06 1 2008 12:00AM' and '06 30 2008 12:00AM' AND EmpID= 117 group by EmpID,manID
结果：
empID manID
117 24
117 113

现在我要…
[/Quote]
楼主试一下这样看这样可不可以。

[大自然D使者]

如果不行，那么提示什么错误呢？

[conan304]

declare @t table(performanaccessID int,empid int,manid int,MarkingDate datetime)
insert @t select 1,117,113,'2008-5-10 8:57:30'
union all select 1,117,24,'2008-5-11 9:57:30'
union all select 1,116,113,'2008-5-11 9:57:31'
union all select 1,116,112,'2008-5-10 8:57:30'
union all select 1,118,110,'2008-5-10 8:57:30'


select * from @t

select empid,manID
from @t k
where MarkingDate between '05  1 2008 12:00AM' and '05 30 2008 12:00AM'
and MarkingDate=(select max(MarkingDate) from @t where k.empid=empid)

/*
所影响的行数为 5 行）

performanaccessID empid       manid       MarkingDate             
----------------- ----------- ----------- ------------------------
1                 117         113         2008-05-10 08:57:30.000
1                 117         24          2008-05-11 09:57:30.000
1                 116         113         2008-05-11 09:57:31.000
1                 116         112         2008-05-10 08:57:30.000
1                 118         110         2008-05-10 08:57:30.000

（所影响的行数为 5 行）

empid       manID       
----------- ----------- 
117         24
116         113
118         110

（所影响的行数为 3 行）

*/

[conan304]

或者(Sorry,六楼没写好)：

select empid,manID
from @t k
where MarkingDate between '05  1 2008 12:00AM' and '05 30 2008 12:00AM'
and not exists(select 1 from @t where MarkingDate>k.MarkingDate and k.empid=empid)
/*
empid       manID       
----------- ----------- 
117         24
116         113
118         110

（所影响的行数为 3 行）
*/

[conan304]

--如果要考虑empid=118,但是时间范围在5.1-.31之间的数据，也就是说118应该
--选择118，110的数据，则要用临时表，可能还有更好的方法，等高人

declare @t table(performanaccessID int,empid int,manid int,MarkingDate datetime)
insert @t select 1,117,113,'2008-5-10 8:57:30'
union all select 1,117,24,'2008-5-11 9:57:30'
union all select 1,116,113,'2008-5-11 9:57:31'
union all select 1,116,112,'2008-5-10 8:57:30'
union all select 1,118,110,'2008-5-10 8:57:30'
union all select 1,118,111,'2008-6-10 8:57:30'


select * from @t

select * into # 
from @t
where MarkingDate between '05  1 2008 12:00AM' and '05 30 2008 12:00AM'

select empid,manID
from # k
where MarkingDate=(select max(MarkingDate) from # where k.empid=empid)
order by 1

drop table
/*
所影响的行数为 6 行）

performanaccessID empid       manid       MarkingDate            
----------------- ----------- ----------- ------------------------
1                 117         113         2008-05-10 08:57:30.000
1                 117         24          2008-05-11 09:57:30.000
1                 116         113         2008-05-11 09:57:31.000
1                 116         112         2008-05-10 08:57:30.000
1                 118         110         2008-05-10 08:57:30.000
1                 118         111         2008-06-10 08:57:30.000

（所影响的行数为 6 行）


（所影响的行数为 5 行）

empid       manID       
----------- ----------- 
116         113
117         24
118         110

（所影响的行数为 3 行）

*/

[conan304]

转SQL版龟帖：

--按某一字段分组取最大(小)值所在行的数据
(爱新觉罗.毓华 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
*/
--七，如果整行数据有重复，所有的列都相同。
/*
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    1   a1--a的第一个值
a    3   a3:a的第三个值
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
*/
--在sql server 2000中只能用一个临时表来解决，生成一个自增列，先对val取最大或最小，然后再通过自增列来取数据。
--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',    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('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

select * , px = identity(int,1,1) into tmp from tb

select m.name,m.val,m.memo from
(
  select t.* from tmp t where val = (select min(val) from tmp where name = t.name)
) m where px = (select min(px) from
(
  select t.* from tmp t where val = (select min(val) from tmp where name = t.name)
) n where n.name = m.name)

drop table tb,tmp

/*
name       val         memo
---------- ----------- --------------------
a          1           a1--a的第一个值
b          1           b1--b的第一个值

(2 行受影响)
*/
--在sql server 2005中可以使用row_number函数，不需要使用临时表。
--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',    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('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

select m.name,m.val,m.memo from
(
  select * , px = row_number() over(order by name , val) from tb
) m where px = (select min(px) from
(
  select * , px = row_number() over(order by name , val) from tb
) n where n.name = m.name)

drop table tb

/*
name       val         memo
---------- ----------- --------------------
a          1           a1--a的第一个值
b          1           b1--b的第一个值

(2 行受影响)
*/

[liyouli_love_22]

[Quote=引用 12 楼 xiaogang107 的回复:]
引用楼主 liyouli_love_22 的帖子:
PerformanaccessID empID manID MakingDate
1 117 113 2008-5-10 8:57:30
1 117 24 2008-5-11 9:57:30

SQL语句：
select distinct EmpID,max（manID） from KhTbwDoingPerAccessRecord where 1=1 and MarkingDate between '06 1 2008 12:00AM' and '06 30 2008 12:00AM' AND EmpID= 117 group by EmpID,manID
结果：
empID ma…
[/Quote]

empID、manID代表的是两个人，不可以用max()函数的