SQL Overview
- Structured Query Language (Structured Query Language, SQL) is the standard language for relational databases, is a common, highly functional relational database language. Its function is not only a query, but includes the database schema is created, insert and modify database data, database security and integrity of the definition of control and a series of functions.
A, SQL generation and development
1. History
2. Development
Two, SQL features
1. Integrated unity
2. highly non-procedural
3. The operation set for
4. to provide a variety of ways using the same syntax structure
5. concise language
Third, the basic concepts of SQL
1. Basic Table
2. Storage file
3. view
"Introduction to Data System (fifth edition)" - - Reference Renmin University - Wang Shan