消除查询结果的某列

[jishengzu]

查询语句为

select DISTINCT * from (SELECT  tc.*,ROW_NUMBER() over(order by tc.id) as rowNum
	FROM DEF_TreatmentCourse tc,DEF_TreatmentCourseService where TCId=tc.id) as mytab

结果如下

应为多了个rowNum所以消除重复的就不行了 但rowNum要在where中用到
有什么办法能查询时不显示该rowNum列但where中能用到呢
希望的结果是

如果上面思路实现不了 那换中思路，唯一要求是支持分页语句，语句越简单越好

问题解决后连http://topic.csdn.net/u/20081215/17/f60847d8-182e-4b6d-9f36-ac4bdc08193b.html
一并结贴给分

[水族杰纶]

看看

[中国风]

select  * from 
(SELECT  tc.*,ROW_NUMBER() over(order by tc.id) as rowNum
    FROM DEF_TreatmentCourse tc,DEF_TreatmentCourseService 
where TCId=tc.id
group by ...............--顯示列 tc.*部份
) as mytab

[baoshan]

select DISTINCT 列名1,列名2,... from (SELECT tc.*,ROW_NUMBER() over(order by tc.id) as rowNum
FROM DEF_TreatmentCourse tc,DEF_TreatmentCourseService where TC。Id=tc.id) as mytab

[baoshan]

不显示rownum 列

[jishengzu]

[Quote=引用 2 楼 roy_88 的回复:]
SQL codeselect * from
(SELECT tc.*,ROW_NUMBER() over(order by tc.id) as rowNum
FROM DEF_TreatmentCourse tc,DEF_TreatmentCourseService
where TCId=tc.id
group by ...............--顯示列 tc.*部份
) as mytab
[/Quote]

select * from
(SELECT tc.*,ROW_NUMBER() over(order by tc.id) as rowNum
FROM DEF_TreatmentCourse tc,DEF_TreatmentCourseService
where TCId=tc.id group by tc.*
) as mytab

这样不行报错
消息 102，级别 15，状态 1，第 4 行
'*' 附近有语法错误。

[冷箫轻笛]

--这样？
select * ,ROW_NUMBER() over(order by tc.id) as rowNum

from 
(SELECT distinct tc.*
  FROM DEF_TreatmentCourse tc,DEF_TreatmentCourseService where TCId=tc.id) as mytab

[jishengzu]

[Quote=引用 3 楼 baoshan 的回复:]
select DISTINCT 列名1,列名2,... from (SELECT tc.*,ROW_NUMBER() over(order by tc.id) as rowNum
FROM DEF_TreatmentCourse tc,DEF_TreatmentCourseService where TC。Id=tc.id) as mytab
[/Quote]

这样当然行了 但列太多就麻烦了

[wzy_love_sly]

;with page as
(
select *,row_number() over(order by id) as rnum from 
(select distinct * from 你的表名)t
)
select * from page
where rnum between 2 and 4 --2和4用你的页和每页数量自己算出来

[jishengzu]

[Quote=引用 6 楼 coolingpipe 的回复:]
SQL code
--这样？
select * ,ROW_NUMBER() over(order by tc.id) as rowNum

from
(SELECT distinct tc.*
FROM DEF_TreatmentCourse tc,DEF_TreatmentCourseService where TCId=tc.id) as mytab
[/Quote]

谢谢这个不错 结贴了

[dawugui]

select m.* from 
(
  SELECT tc.*, ROW_NUMBER() over(order by tc.id) as rowNum FROM DEF_TreatmentCourse tc,DEF_TreatmentCourseService where TCId=tc.id
) m where rownum = (select max(rownum) from
(
  SELECT tc.*, ROW_NUMBER() over(order by tc.id) as rowNum FROM DEF_TreatmentCourse tc,DEF_TreatmentCourseService where TCId=tc.id
) n where n.id = m.id
)

[dawugui]

--按某一字段分组取最大(小)值所在行的数据
--(爱新觉罗.毓华(十八年风雨,守得冰山雪莲花开) 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,a.val
/*
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 , a.val
/*
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)
*/

[c304189466]

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