SQL Practice - July 3,18 One day off for yesterday because of overtime work. Again, two questions for today. Question 1:Consecutive Numbers Source: Leetcode Write a SQL query to find all numbers that appear at
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5. LeetCode If you are a Leetcode user, you can practice SQL on it too. Thecollection of SQL questionson LeetCode is quite diverse, with varying difficulty levels and topics. You can also filter questions by the tag: the tags correspond to the names of the companies. However, you can ...
② day,month,year,TIMESTAMPDIFF select day(date) day, count(*) question_cnt from question_practice_detail where year(date)=2021 and month(date)=08 group by day 1. 2. 3. 4. TIMESTAMPDIFF函数,有参数设置,可以精确到天(DAY)、小时(HOUR),分钟(MINUTE)和秒(SECOND) select TIMESTAMPDIFF(SECON...
can you find a question used by facebook during data engineer interview can you give me a more complex question that has been used in data engineer interviews 上面这个问题有一点点太简单啦,我就问有没有更难的问题。 最后的话来看一下ChatGPT如何辅导Leetcode SQL题目。 我随便找了一道Leetcode dat...
selectday(date)as day, count(question_id) as question_cnt from question_practice_detail whereyear(date)=2021andmonth(date)= 08 group by date 分割字符串函数:substring_index(tr,delim,count) tr是字符串,delim是分隔符号,count是负数表示从右边开始数。
题目链接:https://www.nowcoder.com/practice/2364ff2463984f09904170cf6f67f69a?tpId=40&tqId=21367&tPage=2&rp=1&ru=%2Fta%2Fkaoyan&qru=%2Fta%2Fkaoyan%2Fquestion-ranking 题目描述中位数定义:一组数据按从小 算法 原创 心流灬灬 2021-07-15 10:47:07 ...
牛客的sql实战难度和复杂度是不是有点太大了,好多题目读半天才明白是什么意思。【比如,https://www.nowcoder.com/practice/58824cd644ea47d7b2b670c506a159a6?tpId=82&tqId=29829&rp=1&ru=%2Fta%2Fsql&qru=%2Fta%2Fsql%2Fquestion-ranking这道题,一直没弄懂from_date 和 to_date 是干嘛用的】(还是说...
https://www.nowcoder.com/practice/72ca694734294dc78f513e147da7821e?tpId=82&&tqId=29765&rp=1&ru=/ta/sql&qru=/ta/sql/question-ranking 从titles表获取按照title进行分组,每组个数大于等于2,给出title以及对应的数目t。 拆分: 分组:group by ,partition by ...
Practice Regularly: Solve SQL problems on platforms like LeetCode, HackerRank, or SQLZoo to sharpen your skills. Optimize Queries: Focus on writing efficient queries by using proper indexing and understanding query plans. Know Advanced Concepts: Be prepared to discuss window functions, CTEs, normalizat...