MySQL练习题50题,最好的版本,入门必做! 数据分析王子 MySQL第一阶段学习总结 一、推荐课程及刷题网站1、写在前面的话虽然现在还没有将MySQL精通,但第一阶段的SQL学习终于告一段落,该做个总结~ 2、MySQL推荐课程 1)B站《尚硅谷MySQL课程》MySQL数据库教程天花板,my… 诚书洞发表于数据分析~...打开...
select name,population,area from World where area>=3000000or population>=25000000/* Write your T-SQL query statement below */select name,population,area from World where area>=3000000or population>=25000000/* Write your PL/SQL query statement below */select name"name",population"population",area...
顺序是从 Top interview 150 -> top liked 100: Top acceptance -> lowest acceptance. 344 Rev...Leetcode刷题记录 1. 两数之和 给定一个整数数组 nums 和一个目标值 target,请你在该数组中找出和为目标值的那 两个 整数,并返回他们的数组下标。 你可以假设每种输入只会对应一个答案。但是,你不能...
group_concat(distinctproduct)asproductsfromActivitiesgroupbysell_date/* Write your T-SQL query statement below */SELECTSTUFF((SELECT','+productFROMActivitiesforxmlpath('')),1,1,'')/* Write your T-SQL query statement below */selectsell_date, count(distinctproduct)asnum_sold, stuff((selectdisti...
刷LeetCode的方式:先从Top100 liked 的tag开始刷(这个tag的题我刷了好几遍)。刷完之后按topic的tag刷过一段时间,后来改成了选择难度之后按顺序刷。一开始就按照ac率从高到低乱刷,后面就只刷点赞比点踩多不少的题。有一段时间每周的周赛基本都参加,不过最后也就是2000分的水准,比较弱。我一道题如果较长...
Line 6 Line 7 Line 8 Line 9 Line 10 Your script should output the tenth line, which is: Line 10 我的sql语句如下: SELECT d.name as department, e.name,e.salary FROM Employee e JOIN Department d ON e.departmentid = d.id and
Write a SQL query tofind employees who earn the top three salaries in each of the department. For the above tables, your SQL query should return the following rows. +---+---+---+ | Department | Employee | Salary | +---+---+---+ | IT | Max...
Boost your coding interview skills and confidence by practicing real interview questions with LeetCode. Our platform offers a range of essential problems for practice, as well as the latest questions being asked by top-tier companies.
Write a SQL query to find employees who earn the top three salaries in each of the department. For the above tables, your SQL query should return the following rows (order of rows does not matter). 题意 编写一个 SQL 查询,找出每个部门获得前三高工资的所有员工 ...
对leetcode网站上数据库专题下每道题目,包括会员题目,都做了详细的题解。总共有50多道题。题解内容通常有这么几个部分,题目简述、解法思路、逻辑步骤、重要知识点解释、个人犯的错误和SQL代码。写题解的态度是认真的,前后花了较多的时间。既为给自己日后复习提供便利,