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# LC SQL Resource | ||
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- LC SQL high frequent | ||
- [LC sql high frequent 50](https://blog.csdn.net/qq_44186838/article/details/118713154) | ||
- [LeetCode Curated SQL 70](https://leetcode.com/problem-list/5htp6xyg/?page=1) | ||
- [cheatsheet-mysql-a4](https://cheatsheet.dennyzhang.com/cheatsheet-mysql-a4) | ||
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- SQL | ||
- [SQL exercises](https://www.w3resource.com/sql-exercises/) - w3resource SQL exercises | ||
- [SQL tutorial](https://mode.com/sql-tutorial/) - mode.com sql tutorial | ||
- [SQL zoo](https://sqlzoo.net/) - SQL test | ||
- [10 SQL Tricks](https://blog.jooq.org/10-sql-tricks-that-you-didnt-think-were-possible/) : 10 SQL Tricks That You Didn’t Think Were Possible | ||
- [Zachary Thomas' SQL Questions](https://lnkd.in/g-JJzuD) -- The Best Medium-Hard Data Analyst SQL Interview Questions | ||
- [pdf](./doc/The-Best-Medium-Hard-Data-Analyst-SQL-Interview-Questions.pdf) | ||
- [Select * SQL](https://selectstarsql.com/) | ||
- [LinkedIn Learning](https://lnkd.in/gQXFc4n) | ||
- [Window Functions](https://lnkd.in/g3RtPCJ) | ||
- [HackerRank](https://lnkd.in/grv_9sB) | ||
- [W3 Schools](https://lnkd.in/gJPfrrv) | ||
- [CodeAcademy](https://lnkd.in/gT5xmpN) | ||
- [SQL Bolt](https://sqlbolt.com/) | ||
- [self-joins-calculate-retention-churn-and-reactivation-metrics](https://www.sisense.com/blog/use-self-joins-to-calculate-your-retention-churn-and-reactivation-metrics/) | ||
- [Prod metric design](https://quip.com/edU3AgdiNOo1) |