leetcode_gym/_problems/sql_combine2tables.md

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layout	title	last_solved	category	leetcode_url	status
page	combine 2 tables		sql	https://leetcode.com/problems/combine-two-tables/	solved

Problem

SQL Schema
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

Solution

{% highlight sql %}

Write your MySQL query statement below

select p.firstname, p.lastname, a.city, a.state

from person p, address a

where p.personid=a.addressid # this is inner join

select p.firstname, p.lastname, a.city, a.state from person p left join address a on p.personid=a.personid

{% endhighlight %}