有这样的记录
create table tb
(
stafferid varchar(10),
[1] varchar(10),
[2] varchar(10),
[3] varchar(10),
[4] varchar(10),
[5] varchar(10),
[6] varchar(10),
[7] varchar(10)
)
insert into tb (stafferid,[3]) select '003313','上午'
insert into tb (stafferid,[4]) select '003313','上午'
insert into tb (stafferid,[6]) select '003313','上午'
insert into tb (stafferid,[7]) select '003313','夜班'
我想得到这样的记录
stafferid 1 2 3 4 5 6 7
003313 上午 上午 上午 夜班 于是我写了下面的语句select stafferid,
case a when 0 then '' when 1 then '上午' when 2 then '下午' when 3 then '夜班 ' end,
case b when 0 then '' when 1 then '上午' when 2 then '下午' when 3 then '夜班 ' end,
case c when 0 then '' when 1 then '上午' when 2 then '下午' when 3 then '夜班 ' end,
case d when 0 then '' when 1 then '上午' when 2 then '下午' when 3 then '夜班 ' end,
case e when 0 then '' when 1 then '上午' when 2 then '下午' when 3 then '夜班 ' end,
case f when 0 then '' when 1 then '上午' when 2 then '下午' when 3 then '夜班 ' end,
case g when 0 then '' when 1 then '上午' when 2 then '下午' when 3 then '夜班 ' end
from (
select stafferid,
a=sum(case [1] when '' then 0 when '上午' then 1 when '下午' then 2 when '夜班' then 3 else 0 end) ,
b=sum(case [2] when '' then 0 when '上午' then 1 when '下午' then 2 when '夜班' then 3 else 0 end) ,
c=sum(case [3] when '' then 0 when '上午' then 1 when '下午' then 2 when '夜班' then 3 else 0 end) ,
d=sum(case [4] when '' then 0 when '上午' then 1 when '下午' then 2 when '夜班' then 3 else 0 end) ,
e=sum(case [5] when '' then 0 when '上午' then 1 when '下午' then 2 when '夜班' then 3 else 0 end) ,
f=sum(case [6] when '' then 0 when '上午' then 1 when '下午' then 2 when '夜班' then 3 else 0 end) ,
g=sum(case [7] when '' then 0 when '上午' then 1 when '下午' then 2 when '夜班' then 3 else 0 end)
from tb group by stafferid ) as t
但是这样写感觉效率上不是很好,case when 判断的条件太多了
想问问还有没有其他的方法
create table tb
(
stafferid varchar(10),
[1] varchar(10),
[2] varchar(10),
[3] varchar(10),
[4] varchar(10),
[5] varchar(10),
[6] varchar(10),
[7] varchar(10)
)
insert into tb (stafferid,[3]) select '003313','上午'
insert into tb (stafferid,[4]) select '003313','上午'
insert into tb (stafferid,[6]) select '003313','上午'
insert into tb (stafferid,[7]) select '003313','夜班'
我想得到这样的记录
stafferid 1 2 3 4 5 6 7
003313 上午 上午 上午 夜班 于是我写了下面的语句select stafferid,
case a when 0 then '' when 1 then '上午' when 2 then '下午' when 3 then '夜班 ' end,
case b when 0 then '' when 1 then '上午' when 2 then '下午' when 3 then '夜班 ' end,
case c when 0 then '' when 1 then '上午' when 2 then '下午' when 3 then '夜班 ' end,
case d when 0 then '' when 1 then '上午' when 2 then '下午' when 3 then '夜班 ' end,
case e when 0 then '' when 1 then '上午' when 2 then '下午' when 3 then '夜班 ' end,
case f when 0 then '' when 1 then '上午' when 2 then '下午' when 3 then '夜班 ' end,
case g when 0 then '' when 1 then '上午' when 2 then '下午' when 3 then '夜班 ' end
from (
select stafferid,
a=sum(case [1] when '' then 0 when '上午' then 1 when '下午' then 2 when '夜班' then 3 else 0 end) ,
b=sum(case [2] when '' then 0 when '上午' then 1 when '下午' then 2 when '夜班' then 3 else 0 end) ,
c=sum(case [3] when '' then 0 when '上午' then 1 when '下午' then 2 when '夜班' then 3 else 0 end) ,
d=sum(case [4] when '' then 0 when '上午' then 1 when '下午' then 2 when '夜班' then 3 else 0 end) ,
e=sum(case [5] when '' then 0 when '上午' then 1 when '下午' then 2 when '夜班' then 3 else 0 end) ,
f=sum(case [6] when '' then 0 when '上午' then 1 when '下午' then 2 when '夜班' then 3 else 0 end) ,
g=sum(case [7] when '' then 0 when '上午' then 1 when '下午' then 2 when '夜班' then 3 else 0 end)
from tb group by stafferid ) as t
但是这样写感觉效率上不是很好,case when 判断的条件太多了
想问问还有没有其他的方法
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Insert Class
select N'张三',N'语文',78 union all
select N'张三',N'数学',87 union all
select N'张三',N'英语',82 union all
select N'张三',N'物理',90 union all
select N'李四',N'语文',65 union all
select N'李四',N'数学',77 union all
select N'李四',N'英语',65 union all
select N'李四',N'物理',85
Go
--2000方法:
动态:declare @s nvarchar(4000)
set @s=''
Select @s=@s+','+quotename([Course])+'=max(case when [Course]='+quotename([Course],'''')+' then [Score] else 0 end)'
from Class group by[Course]
exec('select [Student]'+@s+' from Class group by [Student]')
生成静态:select
[Student],
[数学]=max(case when [Course]='数学' then [Score] else 0 end),
[物理]=max(case when [Course]='物理' then [Score] else 0 end),
[英语]=max(case when [Course]='英语' then [Score] else 0 end),
[语文]=max(case when [Course]='语文' then [Score] else 0 end)
from
Class
group by [Student]GO
动态:declare @s nvarchar(4000)
Select @s=isnull(@s+',','')+quotename([Course]) from Class group by[Course]
exec('select * from Class pivot (max([Score]) for [Course] in('+@s+'))b')生成静态:
select *
from
Class
pivot
(max([Score]) for [Course] in([数学],[物理],[英语],[语文]))b生成格式:
/*
Student 数学 物理 英语 语文
------- ----------- ----------- ----------- -----------
李四 77 85 65 65
张三 87 90 82 78(2 行受影响)
*/------------------------------------------------------------------------------------------
go
--加上总成绩(学科平均分)--2000方法:
动态:declare @s nvarchar(4000)
set @s=''
Select @s=@s+','+quotename([Course])+'=max(case when [Course]='+quotename([Course],'''')+' then [Score] else 0 end)'
from Class group by[Course]
exec('select [Student]'+@s+',[总成绩]=sum([Score]) from Class group by [Student]')--加多一列(学科平均分用avg([Score]))生成动态:select
[Student],
[数学]=max(case when [Course]='数学' then [Score] else 0 end),
[物理]=max(case when [Course]='物理' then [Score] else 0 end),
[英语]=max(case when [Course]='英语' then [Score] else 0 end),
[语文]=max(case when [Course]='语文' then [Score] else 0 end),
[总成绩]=sum([Score]) --加多一列(学科平均分用avg([Score]))
from
Class
group by [Student]go--2005方法:动态:declare @s nvarchar(4000)
Select @s=isnull(@s+',','')+quotename([Course]) from Class group by[Course] --isnull(@s+',','') 去掉字符串@s中第一个逗号
exec('select [Student],'+@s+',[总成绩] from (select *,[总成绩]=sum([Score])over(partition by [Student]) from Class) a
pivot (max([Score]) for [Course] in('+@s+'))b ')生成静态:select
[Student],[数学],[物理],[英语],[语文],[总成绩]
from
(select *,[总成绩]=sum([Score])over(partition by [Student]) from Class) a --平均分时用avg([Score])
pivot
(max([Score]) for [Course] in([数学],[物理],[英语],[语文]))b 生成格式:/*
Student 数学 物理 英语 语文 总成绩
------- ----------- ----------- ----------- ----------- -----------
李四 77 85 65 65 292
张三 87 90 82 78 337(2 行受影响)
*/go
from tb
group by stafferid
/*
stafferid
---------- ---------- ---------- ---------- ---------- ---------- ---------- ----------
003313 NULL NULL 上午 上午 NULL 上午 夜班
*/
(
stafferid varchar(10),
[1] varchar(10),
[2] varchar(10),
[3] varchar(10),
[4] varchar(10),
[5] varchar(10),
[6] varchar(10),
[7] varchar(10)
)
insert into tb (stafferid,[3]) select '003313','上午'
insert into tb (stafferid,[4]) select '003313','上午'
insert into tb (stafferid,[6]) select '003313','上午'
insert into tb (stafferid,[7]) select '003313','夜班'
select stafferid,[1]=max([1]),[2]=max([2]),[3]=max([3]),[4]=max([4]),[5]=max([5]),[6]=max([6]),[7]=max([7])
from tb
group by stafferiddrop table tb
/*
stafferid 1 2 3 4 5 6 7
---------- ---------- ---------- ---------- ---------- ---------- ---------- ----------
003313 NULL NULL 上午 上午 NULL 上午 夜班(所影响的行数为 1 行)
*/
(
stafferid varchar(10),
[1] varchar(10),
[2] varchar(10),
[3] varchar(10),
[4] varchar(10),
[5] varchar(10),
[6] varchar(10),
[7] varchar(10)
)
insert into tb (stafferid,[3]) select '003313','上午'
insert into tb (stafferid,[4]) select '003313','上午'
insert into tb (stafferid,[6]) select '003313','上午'
insert into tb (stafferid,[7]) select '003313','夜班'
select stafferid,[1]=isnull(max([1]),''),[2]=isnull(max([2]),''),[3]=isnull(max([3]),''),
[4]=isnull(max([4]),''),[5]=isnull(max([5]),''),[6]=isnull(max([6]),''),[7]=isnull(max([7]),'')
from tb
group by stafferiddrop table tb
/*
stafferid 1 2 3 4 5 6 7
---------- ---------- ---------- ---------- ---------- ---------- ---------- ----------
003313 上午 上午 上午 夜班(所影响的行数为 1 行)*/
set @i=1
set @s=''
while @i<8
begin
set @s=@s+', '''+cast(@i as varchar(4))+'''=max(case when ['+cast(@i as varchar(4))+']=null then null else ['+cast(@i as varchar(4))+'] end)';
set @i=@i+1
endexec ('select stafferid '+ @s+'from tb group by stafferid ')/*
stafferid 1 2 3 4 5 6 7
---------- ---------- ---------- ---------- ---------- ---------- ---------- ----------
003313 NULL NULL 上午 上午 NULL 上午 夜班*/