1. A brief history of databases
IBM and other companies studied in the 1960s.
Office automation
makes computers a viable solution for data retrieval and storage.
Charles W. Bachman, one of the pioneers of the database
2. What is a database
? One or more large structured collections of permanent data are
usually related to software for updating and querying data. A
simple database can be a file containing many records. It
helps you organize data. A
database can help you store, organize and retrieve data.
Relational Database
Why use a database
Advantages: Fast and efficient data retrieval.
Organize data in a logical way. A
database management system is a sophisticated system that
allows you to establish rules.
The structured query language
SQL has three main roles.
Create a database and define its structure.
Query the database, and have obtained the data needed to answer the question.
Control the security of the database.
Introduction to
SQL query SQL query is the most commonly used function of SQL.
A sub-language called data manipulation language is responsible for query and data manipulation.
SQL compares with other programming languages.
SQL programmers write instructions step by step to tell the computer what to do to achieve a specific goal.
Understand the SQL standard
International standardization
The organization adopts the standard body, but there are still differences between them.
Create database
Organize a relational database
SQL syntax
