以左表为主合并两个表,使用left join... on ...语句.
题目:
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 Person.FirstName, Person.LastName,Address.City,Address.State from Person left join Address on Person.PersonId = Address.PersonId;
知识点:SQL JOIN语句总结