select
a.class_name,
sum(case b.status when 1 then 1 else 0 end) as count1,
sum(case b.status when 2 then 1 else 0 end) as count2,
sum(case b.status when 3 then 1 else 0 end) as count3
from
tb_class a,
tb_content b
where
a.id=b.class_id and b.add_date between '2008-1-1' and '2009-2-30'
group by
a.class_name
insert into @tb_class select 1,'类别1',1
insert into @tb_class select 2,'类别2',1
insert into @tb_class select 3,'类别3',1
insert into @tb_class select 4,'类别4',1
insert into @tb_class select 5,'类别5',2
insert into @tb_class select 6,'类别6',2
insert into @tb_class select 7,'类别7',2
insert into @tb_class select 8,'类别8',3
insert into @tb_class select 9,'类别9',3 declare @tb_content table(id int,class_id int,content varchar(10),status int,add_date datetime)
insert into @tb_content select 1 ,1,'内容1 ',1,'2008-01-01'
insert into @tb_content select 2 ,1,'内容2 ',2,'2008-01-02'
insert into @tb_content select 3 ,1,'内容3 ',3,'2008-03-01'
insert into @tb_content select 4 ,8,'内容4 ',3,'2008-05-08'
insert into @tb_content select 5 ,2,'内容5 ',2,'2008-10-01'
insert into @tb_content select 6 ,2,'内容6 ',1,'2008-10-12'
insert into @tb_content select 7 ,3,'内容7 ',1,'2008-12-02'
insert into @tb_content select 8 ,4,'内容8 ',2,'2008-12-14'
insert into @tb_content select 9 ,6,'内容9 ',3,'2009-01-11'
insert into @tb_content select 10 ,4,'内容10',2,'2009-01-12'
insert into @tb_content select 11 ,5,'内容11',1,'2009-01-13'
insert into @tb_content select 12 ,5,'内容12',3,'2009-01-14'
insert into @tb_content select 13 ,6,'内容13',1,'2009-01-15'
insert into @tb_content select 14 ,7,'内容14',3,'2009-01-16'
insert into @tb_content select 15 ,9,'内容15',2,'2009-02-01'
insert into @tb_content select 16 ,8,'内容16',3,'2009-02-01' select
a.class_name,
sum(case b.status when 1 then 1 else 0 end) as count1,
sum(case b.status when 2 then 1 else 0 end) as count2,
sum(case b.status when 3 then 1 else 0 end) as count3
from
@tb_class a,
@tb_content b
where
a.id=b.class_id and b.add_date between '2008-01-01' and '2009-02-28'
group by
a.class_name/*
class_name count1 count2 count3
---------- ----------- ----------- -----------
类别1 1 1 1
类别2 1 1 0
类别3 1 0 0
类别4 0 2 0
类别5 1 0 1
类别6 1 0 1
类别7 0 0 1
类别8 0 0 2
类别9 0 1 0
*/
SELECT
a.class_name,
count1=SUM(CASE WHEN b.status=1 THEN 1 ELSE 0 END),
count2=SUM(CASE WHEN b.status=2 THEN 1 ELSE 0 END),
count3=SUM(CASE WHEN b.status=3 THEN 1 ELSE 0 END)
FROM
tb_class a
JOIN tb_content b ON a.id = b.id
GROUP BY a.class_name
select
a.class_name,
sum(case b.status when 1 then 1 else 0 end) as count1,
sum(case b.status when 2 then 1 else 0 end) as count2,
sum(case b.status when 3 then 1 else 0 end) as count3
from
tb_class a,
tb_content b
where
a.id=b.class_id and convert(char(10),b.add_date,120) between '2008-01-01' and '2009-02-30'
group by
a.class_name
or
select
a.class_name,
sum(case b.status when 1 then 1 else 0 end) as count1,
sum(case b.status when 2 then 1 else 0 end) as count2,
sum(case b.status when 3 then 1 else 0 end) as count3
from
@tb_class a,
@tb_content b
where
a.id=b.class_id and b.add_date between '2008-1-1' and '2009-2-28'
group by
a.class_name
SELECT
a.class_name,
count1=SUM(CASE WHEN b.status=1 THEN 1 ELSE 0 END),
count2=SUM(CASE WHEN b.status=2 THEN 1 ELSE 0 END),
count3=SUM(CASE WHEN b.status=3 THEN 1 ELSE 0 END)
FROM
tb_class a
JOIN tb_content b ON a.id = b.class_id
WHERE a.id=b.class_id and b.add_date between '2008-01-01' and '2009-02-28'
GROUP BY a.class_name
M.class_name,
sum(case N.status when 1 then 1 else 0 end) as status_1,
sum(case N.status when 2 then 1 else 0 end) as status_2,
sum(case N.status when 3 then 1 else 0 end) as status_3
from
tb_class M,
tb_content N
where
M.id=M.class_id and N.add_date between '2008-1-1' and '2009-2-30'
group by
M.class_name
/*
标题:普通行列转换(version 2.0)
作者:爱新觉罗.毓华(十八年风雨,守得冰山雪莲花开)
时间:2008-03-09
地点:广东深圳
说明:普通行列转换(version 1.0)仅针对sql server 2000提供静态和动态写法,version 2.0增加sql server 2005的有关写法。问题:假设有张学生成绩表(tb)如下:
姓名 课程 分数
张三 语文 74
张三 数学 83
张三 物理 93
李四 语文 74
李四 数学 84
李四 物理 94
想变成(得到如下结果):
姓名 语文 数学 物理
---- ---- ---- ----
李四 74 84 94
张三 74 83 93
-------------------
*/create table tb(姓名 varchar(10) , 课程 varchar(10) , 分数 int)
insert into tb values('张三' , '语文' , 74)
insert into tb values('张三' , '数学' , 83)
insert into tb values('张三' , '物理' , 93)
insert into tb values('李四' , '语文' , 74)
insert into tb values('李四' , '数学' , 84)
insert into tb values('李四' , '物理' , 94)
go--SQL SERVER 2000 静态SQL,指课程只有语文、数学、物理这三门课程。(以下同)
select 姓名 as 姓名 ,
max(case 课程 when '语文' then 分数 else 0 end) 语文,
max(case 课程 when '数学' then 分数 else 0 end) 数学,
max(case 课程 when '物理' then 分数 else 0 end) 物理
from tb
group by 姓名--SQL SERVER 2000 动态SQL,指课程不止语文、数学、物理这三门课程。(以下同)
declare @sql varchar(8000)
set @sql = 'select 姓名 '
select @sql = @sql + ' , max(case 课程 when ''' + 课程 + ''' then 分数 else 0 end) [' + 课程 + ']'
from (select distinct 课程 from tb) as a
set @sql = @sql + ' from tb group by 姓名'
exec(@sql) --SQL SERVER 2005 静态SQL。
select * from (select * from tb) a pivot (max(分数) for 课程 in (语文,数学,物理)) b--SQL SERVER 2005 动态SQL。
declare @sql varchar(8000)
select @sql = isnull(@sql + '],[' , '') + 课程 from tb group by 课程
set @sql = '[' + @sql + ']'
exec ('select * from (select * from tb) a pivot (max(分数) for 课程 in (' + @sql + ')) b')---------------------------------/*
问题:在上述结果的基础上加平均分,总分,得到如下结果:
姓名 语文 数学 物理 平均分 总分
---- ---- ---- ---- ------ ----
李四 74 84 94 84.00 252
张三 74 83 93 83.33 250
*/--SQL SERVER 2000 静态SQL。
select 姓名 姓名,
max(case 课程 when '语文' then 分数 else 0 end) 语文,
max(case 课程 when '数学' then 分数 else 0 end) 数学,
max(case 课程 when '物理' then 分数 else 0 end) 物理,
cast(avg(分数*1.0) as decimal(18,2)) 平均分,
sum(分数) 总分
from tb
group by 姓名--SQL SERVER 2000 动态SQL。
declare @sql varchar(8000)
set @sql = 'select 姓名 '
select @sql = @sql + ' , max(case 课程 when ''' + 课程 + ''' then 分数 else 0 end) [' + 课程 + ']'
from (select distinct 课程 from tb) as a
set @sql = @sql + ' , cast(avg(分数*1.0) as decimal(18,2)) 平均分 , sum(分数) 总分 from tb group by 姓名'
exec(@sql) --SQL SERVER 2005 静态SQL。
select m.* , n.平均分 , n.总分 from
(select * from (select * from tb) a pivot (max(分数) for 课程 in (语文,数学,物理)) b) m,
(select 姓名 , cast(avg(分数*1.0) as decimal(18,2)) 平均分 , sum(分数) 总分 from tb group by 姓名) n
where m.姓名 = n.姓名--SQL SERVER 2005 动态SQL。
declare @sql varchar(8000)
select @sql = isnull(@sql + ',' , '') + 课程 from tb group by 课程
exec ('select m.* , n.平均分 , n.总分 from
(select * from (select * from tb) a pivot (max(分数) for 课程 in (' + @sql + ')) b) m ,
(select 姓名 , cast(avg(分数*1.0) as decimal(18,2)) 平均分 , sum(分数) 总分 from tb group by 姓名) n
where m.姓名 = n.姓名')drop table tb ------------------
------------------/*
问题:如果上述两表互相换一下:即表结构和数据为:
姓名 语文 数学 物理
张三 74 83 93
李四 74 84 94
想变成(得到如下结果):
姓名 课程 分数
---- ---- ----
李四 语文 74
李四 数学 84
李四 物理 94
张三 语文 74
张三 数学 83
张三 物理 93
--------------
*/create table tb(姓名 varchar(10) , 语文 int , 数学 int , 物理 int)
insert into tb values('张三',74,83,93)
insert into tb values('李四',74,84,94)
go--SQL SERVER 2000 静态SQL。
select * from
(
select 姓名 , 课程 = '语文' , 分数 = 语文 from tb
union all
select 姓名 , 课程 = '数学' , 分数 = 数学 from tb
union all
select 姓名 , 课程 = '物理' , 分数 = 物理 from tb
) t
order by 姓名 , case 课程 when '语文' then 1 when '数学' then 2 when '物理' then 3 end--SQL SERVER 2000 动态SQL。
--调用系统表动态生态。
declare @sql varchar(8000)
select @sql = isnull(@sql + ' union all ' , '' ) + ' select 姓名 , [课程] = ' + quotename(Name , '''') + ' , [分数] = ' + quotename(Name) + ' from tb'
from syscolumns
where name! = N'姓名' and ID = object_id('tb') --表名tb,不包含列名为姓名的其它列
order by colid asc
exec(@sql + ' order by 姓名 ')--SQL SERVER 2005 动态SQL。
select 姓名 , 课程 , 分数 from tb unpivot (分数 for 课程 in([语文] , [数学] , [物理])) t--SQL SERVER 2005 动态SQL,同SQL SERVER 2000 动态SQL。--------------------
/*
问题:在上述的结果上加个平均分,总分,得到如下结果:
姓名 课程 分数
---- ------ ------
李四 语文 74.00
李四 数学 84.00
李四 物理 94.00
李四 平均分 84.00
李四 总分 252.00
张三 语文 74.00
张三 数学 83.00
张三 物理 93.00
张三 平均分 83.33
张三 总分 250.00
------------------
*/select * from
(
select 姓名 as 姓名 , 课程 = '语文' , 分数 = 语文 from tb
union all
select 姓名 as 姓名 , 课程 = '数学' , 分数 = 数学 from tb
union all
select 姓名 as 姓名 , 课程 = '物理' , 分数 = 物理 from tb
union all
select 姓名 as 姓名 , 课程 = '平均分' , 分数 = cast((语文 + 数学 + 物理)*1.0/3 as decimal(18,2)) from tb
union all
select 姓名 as 姓名 , 课程 = '总分' , 分数 = 语文 + 数学 + 物理 from tb
) t
order by 姓名 , case 课程 when '语文' then 1 when '数学' then 2 when '物理' then 3 when '平均分' then 4 when '总分' then 5 enddrop table tb
insert into @tb_class select 1,'类别1',1
insert into @tb_class select 2,'类别2',1
insert into @tb_class select 3,'类别3',1
insert into @tb_class select 4,'类别4',1
insert into @tb_class select 5,'类别5',2
insert into @tb_class select 6,'类别6',2
insert into @tb_class select 7,'类别7',2
insert into @tb_class select 8,'类别8',3
insert into @tb_class select 9,'类别9',3 declare @tb_content table(id int,class_id int,content varchar(10),status int,add_date datetime)
insert into @tb_content select 1 ,1,'内容1 ',1,'2008-01-01'
insert into @tb_content select 2 ,1,'内容2 ',2,'2008-01-02'
insert into @tb_content select 3 ,1,'内容3 ',3,'2008-03-01'
insert into @tb_content select 4 ,8,'内容4 ',4,'2008-05-08'
insert into @tb_content select 5 ,2,'内容5 ',2,'2008-10-01'
insert into @tb_content select 6 ,2,'内容6 ',1,'2008-10-12'
insert into @tb_content select 7 ,3,'内容7 ',1,'2008-12-02'
insert into @tb_content select 8 ,4,'内容8 ',2,'2008-12-14'
insert into @tb_content select 9 ,6,'内容9 ',5,'2009-01-11'
insert into @tb_content select 10 ,4,'内容10',2,'2009-01-12'
insert into @tb_content select 11 ,5,'内容11',1,'2009-01-13'
insert into @tb_content select 12 ,5,'内容12',3,'2009-01-14'
insert into @tb_content select 13 ,6,'内容13',1,'2009-01-15'
insert into @tb_content select 14 ,7,'内容14',3,'2009-01-16'
insert into @tb_content select 15 ,9,'内容15',2,'2009-02-01'
insert into @tb_content select 16 ,8,'内容16',3,'2009-02-01' select
a.class_name,
sum(case b.status when 1 then 1 else 0 end) as count1,
sum(case b.status when 2 then 1 else 0 end) as count2,
sum(case when b.status not in(1,2) then 1 else 0 end) as countOther
from
@tb_class a,
@tb_content b
where
a.id=b.class_id and b.add_date between '2008-01-01' and '2009-02-28'
group by
a.class_name/*
class_name count1 count2 countOther
---------- ----------- ----------- -----------
类别1 1 1 1
类别2 1 1 0
类别3 1 0 0
类别4 0 2 0
类别5 1 0 1
类别6 1 0 1
类别7 0 0 1
类别8 0 0 2
类别9 0 1 0
*/
select
a.class_name,
sum(case b.status when 1 then 1 else 0 end) as count1,
sum(case b.status when 2 then 1 else 0 end) as count2,
sum(case b.status when 1 then 0 when 2 then 0 else 1 end) as count3
from
tb_class a,
tb_content b
where
a.id=b.class_id and b.add_date between '2008-01-01' and '2009-02-28'
group by
a.class_name
insert into @tb_class select 1,'类别1',1
insert into @tb_class select 2,'类别2',1
insert into @tb_class select 3,'类别3',1
insert into @tb_class select 4,'类别4',1
insert into @tb_class select 5,'类别5',2
insert into @tb_class select 6,'类别6',2
insert into @tb_class select 7,'类别7',2
insert into @tb_class select 8,'类别8',3
insert into @tb_class select 9,'类别9',3 declare @tb_content table(id int,class_id int,content varchar(10),status int,add_date datetime)
insert into @tb_content select 1 ,1,'内容1 ',1,'2008-01-01'
insert into @tb_content select 2 ,1,'内容2 ',2,'2008-01-02'
insert into @tb_content select 3 ,1,'内容3 ',3,'2008-03-01'
insert into @tb_content select 4 ,8,'内容4 ',4,'2008-05-08'
insert into @tb_content select 5 ,2,'内容5 ',2,'2008-10-01'
insert into @tb_content select 6 ,2,'内容6 ',1,'2008-10-12'
insert into @tb_content select 7 ,3,'内容7 ',1,'2008-12-02'
insert into @tb_content select 8 ,4,'内容8 ',2,'2008-12-14'
insert into @tb_content select 9 ,6,'内容9 ',5,'2009-01-11'
insert into @tb_content select 10 ,4,'内容10',2,'2009-01-12'
insert into @tb_content select 11 ,5,'内容11',1,'2009-01-13'
insert into @tb_content select 12 ,5,'内容12',3,'2009-01-14'
insert into @tb_content select 13 ,6,'内容13',1,'2009-01-15'
insert into @tb_content select 14 ,7,'内容14',3,'2009-01-16'
insert into @tb_content select 15 ,9,'内容15',2,'2009-02-01'
insert into @tb_content select 16 ,8,'内容16',3,'2009-02-01' select
a.class_name,
sum(case b.status when 1 then 1 else 0 end) as count1,
sum(case b.status when 2 then 1 else 0 end) as count2,
sum(case when b.status not in(1,2) then 1 else 0 end) as countOther,
count(*) as countAll
from
@tb_class a,
@tb_content b
where
a.id=b.class_id and b.add_date between '2008-01-01' and '2009-02-28'
group by
a.class_name/*
class_name count1 count2 countOther countAll
---------- ----------- ----------- ----------- -----------
类别1 1 1 1 3
类别2 1 1 0 2
类别3 1 0 0 1
类别4 0 2 0 2
类别5 1 0 1 2
类别6 1 0 1 2
类别7 0 0 1 1
类别8 0 0 2 2
类别9 0 1 0 1
*/