Watch tutorials and explanations by expert teachers that walk through solving this problem.
Code with Carter
Everyday Data Science
Data Alchemist
WinEi
Solve more problems to master this pattern
![LeetCode 1384 - Total Sales Amount By Year | LeetCode SQL Solution [HARD]](https://i.ytimg.com/vi/TBufPom-KS8/hq720.jpg?sqp=-oaymwEXCNAFEJQDSFryq4qpAwkIARUAAIhCGAE=&rs=AOn4CLDukUDrtCxaRw-KfqaxURpxWaaWVQ)
![2004. Number of Seniors and Juniors to Join the Company - LeetCode SQL Solution [HARD]](https://i.ytimg.com/vi/mLVULApGD0s/hq720.jpg?sqp=-oaymwEXCNAFEJQDSFryq4qpAwkIARUAAIhCGAE=&rs=AOn4CLAtEQXSEvOTAHrqzo8McoIjO6Bnmw)
