leetcode 175. Combine Two Tables

175. Combine Two Tables

 

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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 p.FirstName,p.LastName,a.City,a.State from Person p left join Address a using PersonId;# SELECT p.FirstName, p.LastName, a.City, a.State FROM Person p LEFT JOIN Address a USING (PersonId);SELECT p.FirstName, p.LastName, a.City, a.State FROM Person p LEFT JOIN Address a USING (PersonId);时灵时不灵的，好奇怪。。。有时候平台会报 内部错误。。。