Leetcode的Sql题,主要刷hard 查看原帖 1 12-19 11:34 深圳大学 前端工程师 昨天好刺激的一段经历 看领导不在,下班偷偷早退了半小时。想在家里的群里说一声我下班了,结果发到了工作群里:我下班了哦😐发完就开始开车了,停好车一看手机天都要塌了
LeetCode262-行程和用户 写一段 SQL 语句查出 2013年10月1日 至 2013年10月3日 期间非禁止用户的取消率。基于上表,你的 SQL 语句应返回如下结果,取消率(Cancellation Rate)保留两位小数。 思路: 首先需要明确“非禁止用户的取消率”的计算公式=(被司机或乘客取消的非禁止用户生成的订单数量) / (非禁止用户生...
LC579 - Find Cumulative Salary of an Employee (Hard) 涉及知识: C'estLaVie:SQL学习笔记 - IV:窗口函数- 1.2(Frame Clause) # 本题中要对每个工作月求三个月的累计薪资,设置frame为RANGE 2 PRECEDING即可,最后按题目要求筛掉最近一个工作月。SELECTid,month,SUM(salary)OVER(PARTITIONBYidORDERBYmonthRANGE2...
SELECTSUBSTRING_INDEX( SUBSTRING_INDEX('A,B,C,D,E',',', h.help_topic_id+1),',',-1)AScharsFROMmysql.help_topicAShWHEREh.help_topic_id<( LENGTH('A,B,C,D,E')-LENGTH(REPLACE('A,B,C,D,E',',','') )+1); 上面的SQL查出来的结果如下 mysql.help_topic 是mysql中自带的一张表,...
表:Transactions +---+---+ | Column Name | Type | +---+---+ | trans_id | in...
编写一个SQL查询找出每一个部门薪水排名前3位的雇员信息(排名可以并列),样例如上。 解题思路: 参考StackOverflow的问答(http://stackoverflow.com/questions/12113699/get-top-n-records-for-each-group-of-grouped-results) LeetCode OJ将此题的难度标记为Hard,可见题目的确有一定的难度。 解题步骤: 首先将雇员表...
1represents thegroundcan be walked through. The place with number bigger than 1represents atreecan be walked through, and this positive number represents the tree's height. You are asked to cut off all the trees in this forest in the order of tree's height - always cut off the tree with...
Since free questions may be even mistakenly taken down by some companies, only solutions will be post on now. There are new LeetCode questions every week. I'll keep updating for full summary and better solutions. For more problem solutions, you can see my LintCode, GoogleKickStart, GoogleCo...
Beyond LeetCode SQL This repository covers supplementary analysis of SQL for LeetCode and classic interview questions, tradeoff between performance optimization and developmental efficiency, and how it relates to general database design consideration (e.g. indexing and join). Specific sample databases are...
这些内容都只是蜻蜓点水——我强烈建议你看看课程《Grokking the Coding Interview: Patterns for Coding Questions》,里面提供了全面的解释、示例和编程实践。 下面的模式说明假设你已经知悉了数据结构。如果你还不了解,可以通过这些课程复习一下数据结构:educative.io/m/data-str 我们今天将说明以下 14 种模式: 1....