175. Combine Two Tables (Easy)

Posted 2020-09-19 sixu

Source: https://leetcode.com/problems/combine-two-tables/#/description

Description: 

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:

select t0.FirstName,t0.LastName,t1.City,t1.State
from Person t0 left JOIN Address t1
ON t0.PersonId = t1.PersonId