First of all, mathematical modeling and big data processing applications, of course, this aspect of the application is the advantage of SQL compared to the general processing methods, and in the processing of multi-table cascade relationship, SQL appears to be more concise, for loops or other general way to appear more complex and more prone to error.

Secondly, in application development, whether it is a web application or a mobile application, a database is definitely needed for front-end and back-end data linkage, and although you usually don't design a large amount of data, it is necessary to familiarize yourself with the basic additions, deletions, modifications, and checks of SQL.