LeetCode 175 -Combine Two Tables ( MYSQL )

最新推荐文章于 2024-06-13 13:38:57 发布

原创最新推荐文章于 2024-06-13 13:38:57 发布 · 1.2k 阅读

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本文介绍了一个SQL查询案例，使用左连接(left join)从Person表和Address表中获取人员及其地址信息，即使某些人员没有地址记录也能完整列出。

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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 FirstName ,LastName, City , State from Person left join Address on Person.PersonId = Address.PersonId;