表1: Person
+-------------+---------+
| 列名 | 類型 |
+-------------+---------+
| PersonId | int |
| FirstName | varchar |
| LastName | varchar |
+-------------+---------+
PersonId 是上表主鍵
表2: Address
+-------------+---------+
| 列名 | 類型 |
+-------------+---------+
| AddressId | int |
| PersonId | int |
| City | varchar |
| State | varchar |
+-------------+---------+
AddressId 是上表主鍵
編寫一個 SQL 查詢,滿足條件:無論 person 是否有地址信息,都需要基於上述兩表提供 person 的以下信息:
FirstName, LastName, City, State
PS:條件是無論有地址,都將返回信息
select p.FirstName,p.LastName,a.City,a.State
from Person as p Left join Address as a
On p.PersonId=a.PersonId