SQL Statements

SQL Statements are commands that allow you to interact with a database. There are different types of SQL statements, such as Data Definition Language (DDL), Data Manipulation Language (DML), Data Control Language (DCL), and Transaction Control Language (TCL). Each type of statement has a specific purpose and syntax.

DDL statements are used to create, alter, or drop database objects, such as tables, indexes, views, or triggers. For example, the CREATE TABLE statement allows you to create a new table in the database with the specified columns and constraints.

DML statements are used to insert, update, delete, or select data from database tables. For example, the INSERT INTO statement allows you to add a new row of data to an existing table.

DCL statements are used to grant or revoke permissions to database users or roles. For example, the GRANT statement allows you to give a user or role the right to perform certain actions on a database object.

TCL statements are used to manage transactions in a database. A transaction is a logical unit of work that consists of one or more SQL statements that either succeed or fail as a whole. For example, the COMMIT statement allows you to save the changes made by a transaction to the database.

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