Studying at collage
If you are at college, there will be a database system containing information about yourself, your major and minor fields，
the courses you are enrolled in, details about your financial aid, the class you have taken in previous years or are taking
this year, and details of all your examination results.
如果你在上大学，有一个数据库系统包括你自已信息，你的主要专业和次要专业。
There may also be a database containing details relating to the next year's admissions and a database containing details
of staff working at the university, giving personal details and salay-related detailed for the payroll office.
These are only a few of the application for database systems, and you will no doubt know of plenty of others.
Though we now take such application for granted,the database system is a highly complex technology that has been developed
over the past 40 years.
In the next section, we discuss the percursor to the database system: the file-based system.
在下节，我们讨论数据库系统的前身：文件系统。