We found 2 Reddit comments about The Art of SQL. Here are the top ones, ranked by their Reddit score.
If you are the type that doesn't mind reading a book, there's a book called The Art of SQL, it's all about fine tuning queries for performance, it will definitely help you. https://www.amazon.com/Art-SQL-Peter-Robson-ebook/dp/B0028N4WEC
I found this book to be really good: https://www.amazon.com/Art-SQL-Peter-Robson-ebook-dp-B0028N4WEC/dp/B0028N4WEC/ref=mt_kindle?_encoding=UTF8&me=&qid=1568905015 If you are doing BI with MS SQL I would also start learning DAX.
If you are the type that doesn't mind reading a book, there's a book called The Art of SQL, it's all about fine tuning queries for performance, it will definitely help you. https://www.amazon.com/Art-SQL-Peter-Robson-ebook/dp/B0028N4WEC
I found this book to be really good:
https://www.amazon.com/Art-SQL-Peter-Robson-ebook-dp-B0028N4WEC/dp/B0028N4WEC/ref=mt_kindle?_encoding=UTF8&me=&qid=1568905015
If you are doing BI with MS SQL I would also start learning DAX.