175. Combine Two Tables

描述

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

实现

SELECT p.FirstName AS FirstName, p.LastName AS LastName, a.City AS City, a.State AS State FROM Person p LEFT JOIN Address a ON p.PersonId=a.PersonId;

分析

Runtime: 927ms

转载于:https://www.cnblogs.com/hippiebaby/p/5430953.html