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