175. 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

查询person表中的每个人的地址信息,不管这些人是否有一个地址

MySQL(1128ms):
1 # Write your MySQL query statement below
2 SELECT FirstName , LastName , City , State
3 FROM Person LEFT JOIN Address
4 ON Person.PersonId = Address.PersonId ;
 
原文地址:https://www.cnblogs.com/mengchunchen/p/8317272.html