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...
第三阶段:针对面试的特殊准备,鉴于Leetcode上给了各个公司Tag下最近6个月的常见题目,我在面每家之前都会把该公司(如果Leetcode上有的话)出现过的最近6个月题目按照频率从高往低,至少把Top100 Most Frequent题目刷一遍,很多时候里面只有一半的题目是以前做过的。 第四阶段:由于狗家和某些Pre IPO公司出了名的算法...
LeetCode 刷提记录-SQL 177. Nth Highest Salary CREATE FUNCTION getNthHighestSalary(N INT) RETURNS INT BEGIN DECLARE m INT; #声明局部变量 SET m = n-1; #赋值,因为LIMIT 后面的参数不能是一个表达式 RETURN ( # Write your MySQL query statement below. SELECT DISTINCT salary FROM employee ORDER...
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
| Id | Name | +---+---+ | 1 | IT | | 2 | Sales | +---+---+ 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. +---+---+---+ | ...
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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,
设置若干个桶,每个桶存储出现频率相同的数,桶的下标表示数出现的频率,即出现频次为 i的元素存放在第...,【LeetCode题解】347_前K个高频元素(Top-K-Frequent-Elements)中详细分析了一般排序算法,最小堆,桶排序算法。 PriorityQueue解析见:Java堆结构