175. Combine Two Tables

最新推荐文章于 2020-04-04 17:48:07 发布

SnailRunFast

最新推荐文章于 2020-04-04 17:48:07 发布

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分类专栏： Leet Code SQL 文章标签： Combine Two Tables

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本文提供了一个SQL查询示例，该查询从Person表中选取人员的详细信息，并通过LEFT OUTER JOIN操作与Address表连接，即使某些人员没有对应的地址记录也能确保所有人员的信息被检索。

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Table: Person

+-------------+---------+
| Column Name | Type    |
+-------------+---------+
| PersonId    | int     |
| FirstName   | varchar |
| LastName    | varchar |
+-------------+---------+
PersonId is the primary key column for this table.

Table: Address

+-------------+---------+
| Column Name | Type    |
+-------------+---------+
| AddressId   | int     |
| PersonId    | int     |
| City        | varchar |
| State       | varchar |
+-------------+---------+
AddressId is the primary key column for this table.

Write a SQL query for a report that provides the following information for each person in the Person table, regardless if there is an address for each of those people:

FirstName, LastName, City, State

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SQL:

# Write your MySQL query statement below

select 
    Person.FirstName,
    Person.LastName,
    Address.City,
    Address.State
from 
    Person
left outer join
    Address
on
    Address.PersonId = Person.PersonId
;