LeeCode——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
解题思路较为简单,使用left join
即可解决.
答案如下图所示:
# 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;
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