Table Joins in real applications

Question

What are the benefits of SQL table joins when implementing a mobile app back end for a data operation intense app??

Answer 1

Joins are really for keeping the lines clean between your data sets (tables) and not duplicating the data (but instead creating views of the data through queries).

SQL is just a standard for tabular data. You are welcome to use non-tabular data models if it's more efficient for your purposes.