SQL, or Structured Query Language, is a crucial programming language used for managing and manipulating relational databases. It provides a versatile framework for performing a variety of tasks related to data handling. With SQL, users can create, read, update, and delete data, commonly referred to as CRUD operations. The language encompasses several key components:
- Data Query Language (DQL): This component is responsible for retrieving data, primarily through the SELECT command.
- Data Definition Language (DDL): This part includes commands for defining and modifying database structures, such as CREATE for establishing new tables, ALTER for changing existing tables, and DROP for removing tables.
- Data Manipulation Language (DML): DML handles the actual data manipulation, including INSERT for adding new records, UPDATE for modifying existing records, and DELETE for removing records.
Together, these components make SQL a powerful tool for database management and control.
SQL, or Structured Query Language, is a standardized programming language used for managing and manipulating relational databases. It enables users to perform operations such as creating, reading, updating, and deleting (CRUD) data within a database. SQL commands interact with the database, allowing tasks like querying data, creating tables, modifying records, and setting permissions.
The core aspects of SQL include Data Query Language (DQL), which retrieves data using the SELECT statement; Data Definition Language (DDL), encompassing commands like CREATE to create tables, ALTER to modify tables, and DROP to delete tables; Data Manipulation Language (DML), which includes commands such as INSERT for adding records, UPDATE for modifying records, and DELETE for removing records; and Data Control Language (DCL), which includes GRANT and REVOKE commands to control user access to database objects.
