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 least three times consecutively. For example, given the above Logs table, 1 is...
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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 ...
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...
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...
left join question_practice_detail b on a.device_id=b.device_id where university="复旦大学" group by device_id 1. 2. 3. 4. 5. 6. 7. 8. ⑥ 数学 # 四舍五入 Round(number,2) 1. 2. ⑦ 窗口函数 在mysql8.0中有相关的内置函数,而且考虑了各种排名问题: ...
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 10:47:07 360阅读 中位数 中位数 中位数(...
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...
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...