LeetCode 175 Combine Two Tables mysql,left join 難度:0

標籤：

https://leetcode.com/problems/combine-two-tables/

 

Combine Two Tables

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

select p.FirstName,p.LastName,a.City,a.State from Person as p left join Address as a on p.PersonId = a.PersonId;

　　

 

LeetCode 175 Combine Two Tables mysql,left join 難度:0