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
Person
表左连接
Address
表查询,不能用条件查询,因为
不管该人是否有地址
(
regardless if there is an address for each of those people
)
select FirstName, LastName, City, State
from Person left join Address on Person.PersonId=Address.PersonId
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