Leetcode 175. Combine Two Tables

175. Combine Two Tables

Total Accepted: 25227 Total Submissions: 73988 Difficulty: Easy

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

本弱渣博主准备开始进军leetcode的数据库内容，主要是题目做的太无聊了，并且没有面试光刷题并没有什么卵用。大牛从名校出来，高GPA，项目牛逼就拿面试了，然后随便刷个题就拿offer了，弱渣项目没有简历关都过不了，刷300题也觉得性价比不高啊

思路：

有俩表，需要把俩表的信息整合，用join。因为是regardless of address所以是left join。也就是左表每一行的信息加右边对应同personId的行信息。

# Write your MySQL query statement belowselect a.FirstName, a.LastName, b.City, b.State from Person a left join Address bon a.personid = b.personid;