Leetcode 175. Combine Two Tables

版权声明：本文为博主原创文章，未经博主允许不得转载。 https://blog.csdn.net/u013596119/article/details/81944577

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

Answer:

SELECT FirstName,LastName,City,State FROM Person LEFT JOIN Address on Person.PersonId=Address.PersonId;