1. 原题 https://leetcode.com/problems/combine-two-tables/ 2. 思路 查询表中数据,使用外联结即可。 3. 源码 ...leetcode: 175. Combine Two Tables 175. Combine Two Tables Description Table: Person +---+---+ | Column Name | Type | +---+---+ | PersonId | int | | FirstName | ...
通过外连接来实现。【左外连接:显示左边表中的所有数据,如果右边表对应的数据没有就补NULL】 代码实现 # Write your MySQL query statement below--显示Person表的全部数据,Address表数据不存在就补NULLselectPerson.FirstName, Person.LastName, Address.City, Address.StatefromPersonleftjoinAddressonPerson.personId=...
一、题目 175. Combine Two Tables 二、分析 连接查询的时候要考虑where和on的区别 where : 查询时,连接的时候是必须严格满足条件的,满足了才会加入到临时表中。 on : 查询时,考虑要满足这个条件,如果不满足则不会添加连接的表中的数据。 三、AC代码 SELECTFirstName, LastName, City, StateFROMPerson pLEFTJO...
MySQL有一个配置选项来启用/禁用它。 通常情况下,区分大小写的表和列名是Linux MySQL的默认名称,而大小写不敏感的表和列名过去是Windows上的默认名称,但现在安装程序在安装过程中询问了这一点。 一般数据库中SQL语句对大小写不敏感,一般如SQL关键字、对象名称大小写都会自动转换。但对引号内的字符串大小写会敏感。
The "locationName" has a higher priority than the alternateName, if the searchterm matches both. I can't figure out how to build a query to do that. Since the name can come from one of the two tables, it seems quite difficult to me. Any help is really appreciated!Navigate...
# Write your MySQL query statement below -- Rename the two tables, you can clearly see which table the four fields that need to be queried come from select p.FirstName,p.LastName,a.City,a.State from Person as p left join Address as a on p.PersonId = a.PersonId; Code two: # ...
FirstName, LastName, City, State 直接左连接接 1. 2. 1# Write your MySQL query statement below2SELECTFirstName, LastName, City, StateFROMPerson pLEFTJOINAddress aONp.PersonId=a.PersonId 1. 2.
LeetCode 175. Combine Two Tables LeetCode 175. Combine Two Tables 题目 Table: Person PersonId is the primary key column for this table. Table: Address AddressId is the primary key column for this table. Write a SQL query for a report t......
【leetcode SQL】Combine Two Tables 突然发现leetcode出sql题了,找了道最简单的,找找自信。。 题目如下: FirstName, LastName, City, State 解决方案如下: # Write your MySQL query statement below select FirstName, LastName, City, State from Person a left join Address b on a.PersonId=b.personId...
If you want one result set you will need to join the 2 tables. Eloquent ORM will not solve this problem efficiently you will end up passing in a raw query. A SQL query will do the merge/append/join that you require that is what SQL is for. Are you using MySQL? This is probably ...