SQL每日一題 20210311

有如下一張表t0311

希望得到如下結果：

即對相同的no進行轉置

create

table t0311(
noint
,name nvarchar(20)
,age int
)insert
into t0311
select1,
'張三'
,'18'
union
allselect1,
'李四'
,'17'
union
allselect1,
'王五'
,'23'
union
allselect1,
'趙六'
,'40'
union
allselect2,
'tom'
,'17'
union
allselect3,
'bob'
,'19'
union
allselect3,
'tony'
,'36'
union
allselect3,
'petter'
,'25'

;

with
tempas(
select[no
],[name]
,[age]
, row_number(
)over
(partitionby[
no]order
byno
asc)
as"分組排序"
from
[dbo]
.[t0311]
)select[no
],max(
case 分組排序 when
1then
[name]
else
null
end)
as name1,
max(
case 分組排序 when
1then
[age]
else
null
end)
as age1,
max(
case 分組排序 when
2then
[name]
else
null
end)
as name2,
max(
case 分組排序 when
2then
[age]
else
null
end)
as age2,
max(
case 分組排序 when
3then
[name]
else
null
end)
as name3,
max(
case 分組排序 when
3then
[age]
else
null
end)
as age3,
max(
case 分組排序 when
4then
[name]
else
null
end)
as name4,
max(
case 分組排序 when
4then
[age]
else
null
end)
as age4 
from
temp
groupby[
no]

begin

declare
@maxcol
int,
@iint=1
,@sql
varchar
(1000)=
''select
@maxcol
=max
(總數)
from
(select
count(1
)as"總數"
from
[dbo]
.[t0311]
groupby[
no]) twhile
@i<=
@maxcol
begin
set@sql
=@sql
+'max(case 分組排序 when '
+cast(
@ias
varchar(1
))+' then [name] else null end) as name'
+cast(
@ias
varchar(1
))+',max(case 分組排序 when '
+cast(
@ias
varchar(1
))+' then [age] else null end) as age'
+cast(
@ias
varchar(1
))+','
set@i+=
1end
-- 消除最後','
iflen
(@sql
)>
0set
@sql
=left
(@sql
,len
(@sql)-
1)-- 組裝最後的sql查詢
set@sql
=';with temp as (select [no],[name],[age],row_number() over(partition by [no] order by no asc) as "分組排序" from [dbo].[t0311]) select [no],'
+@sql
+' from temp group by [no]'
exec
(@sql
)end

因為官方寫的是固定列

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