【MySQL】【leetcode】 Combine Two Tables解题报告

题目

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

代码

一个左外连接就行了。

# Write your MySQL query statement below
select FirstName, LastName, City, State from Person left outer join Address on Person.PersonID = Address.PersonID;