SQK Server实现 LeetCode 175 组合两个表

175. 组合两个表

SQL架构

表1: Person

+-------------+---------+
| 列名         | 类型     |
+-------------+---------+
| PersonId    | int     |
| FirstName   | varchar |
| LastName    | varchar |
+-------------+---------+

PersonId 是上表主键

表2: Address

+-------------+---------+
| 列名         | 类型    |
+-------------+---------+
| AddressId   | int     |
| PersonId    | int     |
| City        | varchar |
| State       | varchar |
+-------------+---------+

AddressId 是上表主键

编写一个 SQL 查询，满足条件：无论 person 是否有地址信息，都需要基于上述两表提供 person 的以下信息：

FirstName, LastName, City, State

/* Write your T-SQL query statement below */

select FirstName, LastName,
(select City from Address where Address.PersonId = Person.PersonId ) as City,
(select State from Address where Address.PersonId = Person.PersonId ) as State
from Person