zoukankan      html  css  js  c++  java
  • Combine Two Tables

    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
    直接左连接接
    1 # Write your MySQL query statement below
    2 SELECT FirstName, LastName, City, State FROM Person p LEFT JOIN Address a ON p.PersonId = a.PersonId 
  • 相关阅读:
    array_unshift() 、
    readfile() 函数
    Java的异常处理
    Java 接口
    Java 抽象类
    final关键字
    statice关键字
    dom查询
    JS 正则表达式
    JS对象
  • 原文地址:https://www.cnblogs.com/luckygxf/p/4326122.html
Copyright © 2011-2022 走看看