175. Combine Two Tables

Posted 2020-11-22 wentiliangkaihua

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

# Write your mysql query statement below
SELECT Person.FirstName, Person.LastName, Address.City, Address.State
FROM Person
LEFT JOIN Address
ON Person.PersonId = Address.PersonId;

很明确了，left join