sql查询来组合来自同一个表的结果

Question

我有桌子客户（id，名称）电话（id，customerId，phoneType，phone） 是否可以编写一个返回如下行的查询：

CustomerId，CustomerName，Phone1，Phone2，Mobile1，Mobile2

Phone1，Phone2，Mobile1，Mobile2是手机类型

我试过

select id as CustomerId, name as CustomerName, phone as Phone1
from Customers, Phones
where Customers.id = Phones.customerId and 
Phones.phoneType = N'Phone1'

Answer 1

使用pivot

select *
from (select id as customerid, name as customername, phonetype, phone
     from customers inner join phones on customers.id = phones.customerid
) src
pivot
(max(phone) for phonetype in ([phone1],[phone2],[mobile1],[mobile2])) p