oracle sql加入同一个表中的2行
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时间：2020-09-19 00:07:30 来源:igfitidea点击:
sql join 2 rows in the same table
提问by Dejell
I have the following table:
我有下表：
Name Type Value
---------------------
mike phone 123
mike address nyc
bob address nj
bob phone 333
I want to have the result like this:
我想要这样的结果：
name value value
-------------------
mike nyc 123
bob nj 333
How can I do it?
我该怎么做？
回答by cdonner
it is called a self-join. the trick is to use aliases.
它被称为自连接。诀窍是使用别名。
select
address.name,
address.value as address,
phone.value as phone
from
yourtable as address left join
yourtable as phone on address.name = phone.name
where address.type = 'address' and
(phone.type is null or phone.type = 'phone')
The query assumes that each name has an address, but phone numbers are optional.
该查询假设每个名字都有一个地址，但电话号码是可选的。
回答by Kerrek SB
Something like this:
像这样的东西：
SELECT a.name AS name, phone, address
FROM (SELECT name, value AS phone FROM mytable WHERE type = "phone") AS a
JOIN (SELECT name, value AS address FROM mytable WHERE type = "address") AS b
ON(a.name = b.name);
