sqlzoo answer - SERP Analysis

https://github.com/ritakalach/sqlzoo-solutions

https://github.com/mzebrak/sqlzoo-solutions

https://sqlzoo.net/wiki/SELECT_basics?answer=1

https://sqlzoo.net/wiki/SELECT_from_WORLD_Tutorial?answer=1

https://medium.com/%40mattnwells/sql-zoo-an-introduction-to-mysql-solutions-65850b1602b5

https://cljdoc.org/d/seaquell/seaquell/0.5.2/doc/documentation/sqlzoo-solutions

https://valecv.github.io/SQLZOO-Solutions-2021/

https://www.reddit.com/r/SQL/comments/irbau3/beginner_question_sqlzoo_answer_explanation/

https://sqlzoo.net/wiki/Cheat_Mode

https://stackoverflow.com/questions/42773102/sqlzoo-select-from-world-tutorial-13

https://www.youtube.com/watch?v=nw1YyPbnKak

https://www.quora.com/Where-can-I-find-answers-to-SQLZoo-exercises

https://stackoverflow.com/questions/30934951/sqlzoo-select-within-select-tutorial-5

https://www.sqlzoo.net/

https://www.studocu.com/en-us/document/utah-valley-university/data-security-analytics/sql-answering-the-sql-zoo-questions-2022/75563306

https://cwong8.github.io/projects/sqlzoo/

https://medium.com/%40fredmokami/sql-select-basics-tutorial-sqlzoo-45665fd2fff8

https://terribleatmaths.wordpress.com/2013/10/17/sqlzoo-solutions-select-basics-mysql/

https://www.youtube.com/watch?v=szOGMlfwJSE

https://mode.com/sql-tutorial/

https://sqlbolt.com/

https://terribleatmaths.wordpress.com/2013/10/17/sqlzoo-solutions-select-from-world-tutorial-mysql/

https://www.youtube.com/watch?v=ihwPEVtnVLk

https://sqlzoo.net/wiki/SELECT_Quiz

https://note.com/shincz88/n/n5debf6a2354b

https://www.w3schools.com/sql/sql_exercises.asp

https://www.youtube.com/watch?v=Hqgx9F-Dhs0

https://mjs1995.tistory.com/159

https://sqlzoo.net/wiki/SELECT_from_Nobel_Tutorial

https://zhuanlan.zhihu.com/p/115852084

https://www.youtube.com/watch?v=fdoxNaXdM0Q

https://www.khanacademy.org/computing/computer-programming/sql

https://qiita.com/namb/items/8fcfe1aa8977bfcd201c

https://developer.aliyun.com/article/1353905

https://blog.csdn.net/twist_loki/article/details/119941782

https://rokuroneko.hateblo.jp/archive/category/SQLZOO

https://note.com/shincz88/n/ndea647de70d4

https://www.youtube.com/watch?v=lCbLvHUNBG4

https://blog.csdn.net/weixin_47872288/article/details/115302713

https://qiita.com/m_masashi/items/140b130eef5c62f0e46f

https://www.youtube.com/watch?v=RELAqb4DlvY

https://sqlzoo.net/wiki/Tutorial_Quizzes

https://www.youtube.com/watch?v=R5UDG04rZ9Y

http://napier.sqlzoo.net/wiki/SELECT_within_SELECT_Tutorial

https://www.youtube.com/watch?v=LpfKL8yxvok

https://sqlzoo.net/wiki/SQL_Tutorial/ja

https://www.youtube.com/watch?v=lvdzsNPjDmc

https://sqlzoo.net/wiki/Sql

https://www.youtube.com/watch?v=vCDVsXMMEew

https://sqlzoo.net/wiki/SELECT_.._WHERE