Leetcode 175. 組合兩個表
阿新 • • 發佈:2018-11-13
表1: Person
+-------------+---------+
| 列名 | 型別 |
+-------------+---------+
| PersonId | int |
| FirstName | varchar |
| LastName | varchar |
+-------------+---------+
PersonId 是上表主鍵
表2: Address
+-------------+---------+ | 列名 | 型別 | +-------------+---------+ | 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 是否有地址資訊,都需要基於上述兩表提供 person 的以下資訊:
FirstName, LastName, City, State
PS:條件是無論有地址,都將返回資訊
select p.FirstName,p.LastName,a.City,a.State
from Person as p Left join Address as a
On p.PersonId=a.PersonId