Your question is very complicated. Simply put: 1. You must have learned a programming language in your freshman and sophomore years. 2. "Conventional" programs usually include display interface, background program and database. 3. For me, the database is to make all kinds of tables to store the data needed by the program. For example, you can make a list of class students' grades (name, student number, high score, sports score, etc. )

4. If the program I do is to calculate students whose grades are above 90%, I need to access the database and connect this table. In fact, you may think that you don't need a database, but you can input the data into the program when programming. But what if there are 1000 students in your class? Your program will be wonderful. . . . . 5. So I think the most important thing in learning database is to learn how to interface with your programming program. Learning a single database is very simple. Now you can build tables without language, and so can the mouse. 、、、