The concept of database
1.DB (Data Base): a "warehouse" for storing data, which stores a series of organized data.
2. DBMS (Data Base Management System): database management system, the database is a container created and operated by DBMS.
3. SQL (Structure Query Language): a language specifically used to communicate with the database.
Benefits of the database
1. Persist data to the local
2. It can realize structured query and facilitate the management of
SQL. Advantages:
1. It is not a language unique to a particular database vendor. All DBMSs support SQL.
2. Simple and easy to learn, but strong and powerful, flexible use can be used to carry out complex and advanced operations.
Database characteristics
1. Put the data in the table, and then put the table in the library
2. A database can have multiple tables, each table has a name to identify itself, the table name is unique
3. The table has some Features, these features define how data is stored in a table, similar to the concept of classes in java.
4. A table is composed of rows and columns. The columns are similar to the concept of "attributes", and the rows are similar to the concept of "objects". As a field, the data in the table is classified by DBMS stored in rows
- DBMS (Access) based on shared file system
- Based on client-server DBMS (MySQL, Oracle, SqlServer)