Why is MySQL so commonly used compared to things like MongoDB or when would it be advantageous to use one over the other?

Why can you not use MySQL in a database like MongoDB?

Is a SQL statement the same as a SQL query?

In the second method of using the shell, can you edit the actual database or is it just a copy of it?

If i wanted to delete things from the table, what commands, and in what order, would I use? how would I avoid overwriting a batch file?

How should we study SQL materials? Do you recommend flashcards?


I don't have any questions as of right now- just need to practice!
I believe I will have some questions after I work more with MySQL!