tailieunhanh - MySQL Tutorial Tutorialspoint.com

Tutorials Point, Simply Easy Learning MySQL Tutorial MySQL is the most popular Open Source Relational SQL database management system. MySQL is one of the best RDBMS being used for developing web based software applications. This tutorial gives an initial push to start you with MySQL. For more detail kindly check What is Database? A database is a separate application that stores a collection of data. Each database has one or more distinct APIs for creating, accessing, managing, searching, and replicating the data it holds. Other kinds of data stores can be used, such as files on the file system or large hash. | Tutorials Point Simply Easy Learning MySQL Tutorial MySQL is the most popular Open Source Relational SQL database management system. MySQL is one of the best RDBMS being used for developing web based software applications. This tutorial gives an initial push to start you with MySQL. For more detail kindly check mysql What is Database A database is a separate application that stores a collection of data. Each database has one or more distinct APIs for creating accessing managing searching and replicating the data it holds. Other kinds of data stores can be used such as files on the file system or large hash tables in memory but data fetching and writing would not be so fast and easy with those type of systems. So now a days we use relational database management systems RDBMS to store and manager huge volume of data. This is called relational database because all the data is stored into different tables and relations are established using primary keys or other keys known as foreign keys. A Relational DataBase Management System RDBMS is a software that Enables you to implement a database with tables columns and indexes. Guarantees the Referential Integrity between rows of various tables. Updates the indexes automatically. Interprets an SQL query and combines information from various tables. RDBMS Terminology Before we proceed to explain MySQL database system lets revise few definitions related to database. Database A database is a collection of tables with related data. Table A table is a matrix with data. A table in a database looks like a simple spreadsheet. Column One column data element contains data of one and the same kind for example the column postcode. Row A row tuple entry or record is a group of related data for example the data of one subscription. Redundancy Storing data twice redundantly to make the system faster. Primary Key A primary key is unique. A key value can not occur twice in one table. With a key you can .