使用pivot将行转换为列

Question

这张桌子现在是我的了。

Name    PhoneType   Number
a   Cellular    303-333-3333
a   WorkPHone   444-444-4444
b   Workphone   222-222-2222
c   Cellular    111-111-1111
c   WorkPHone   333-333-3333
c   HomePhone   888-888-8888
d   Cellular    999-999-9999
d   WorkPHone   777-777-7777
d   HomePhone   111-222-3333

我想转换为：

Name    Cellular    Workphone   Homephone
a   303-333-3333    444-444-4444    222-222-2222
b   222-222-2222        
c   111-111-1111    333-333-3333    888-888-8888
d   999-999-9999    777-777-7777    111-222-3333

我试过Pivot，但做不到，因为我不能对电话号码使用聚合函数，因为它是nvarchar。我怎么才能转换。

Answer 1

您可以使用alternate来使用select查询进行透视，如下所示。

with xx as(
select 'a' namee,'cellular' typee,'303-333-3333' numberr from dual union all
select 'a' namee,'WorkPHone' typee,'444-444-4444' numberr from dual union all
select 'b' namee,'WorkPHone' typee,'222-222-2222' numberr from dual union all
select 'c' namee,'cellular' typee,'111-111-1111' numberr from dual union all
select 'c' namee,'WorkPHone' typee,'333-333-3333' numberr from dual union all
select 'c' namee,'HomePhone' typee,'888-888-8888' numberr from dual 
)
select 
 x.namee,
 max(case when x.typee='cellular' then x.numberr else '' end) as CELLULAR,
 max(case when x.typee='WorkPHone' then x.numberr else ''  end) as WORKPHONE,
 max(case when x.typee='HomePhone' then x.numberr else ''  end) as HOMEPHONE
from xx x
group by x.namee
order by x.namee;

编辑：

xx表应替换为您的表名。假设您的表名为my_table，最后的查询将是：

select x.Name , 
max(case when x.PhoneType='cellular' then x.Number else '' end) as CELLULAR,
max(case when x.PhoneType='WorkPHone' then x.Number else '' end) as WORKPHONE,
max(case when x.PhoneType='HomePhone' then x.Number else '' end) as HOMEPHONE 
from 
my_table x 
group by x.Name 
order by x.Name;