MySQL Tutorials - Herong's Tutorial Examples - Version 4.20, by Dr. Herong Yang
SQL and Database Terminologies
This section provides brief descriptions of terminologies related to SQl and database.
RDBMS - Relational Database Management System
Attribute - A kind of information that describes one aspect of a data object. For example, "age" is an attribute of a person, and "salary" is an attribute of an employee. "Attribute" is also called "column".
Relation - A data object defined by a set of attributes. For example, "employee" is a relation with various attributes that define the employee data object. "Relation" is also called "table".
Tuple - An instance of a data object with specific values for all attributes of the relation. For example, one tuple of the "course" relation is the operating system course with "operating system" as the value of the "course name" attribute, and other values for other attributes. "Tuple" is also called "row" or "record".
DDL (Data Definition Language) - A set of SQL statements that manage data structures in the database. Examples of DDL are CREATE, ALTER, DROP, etc.
DML (Data Manipulation Language) - A set of SQL statements that manages data instances in the database. Examples of DML are INSERT, UPDATE, DELETE, etc.
Last update: 2015.
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