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5 Essential Commands That Every SQL Student Should Know
- DDL: Data Definition Language comprises SQL commands that define the database schema. In simple terms, it describes the database schema and modifies database objects' structures. Common DDL commands include DROP, CREATE, TRUNCATE, and ALTER.
- DQL: Data Query Language consists of statements that perform queries on schema objects' data. The SELECT statement is a DQL command.
- DML: Data Manipulation Language modifies data present in the database. DELETE, INSERT, UPDATE, CALL, and LOCK are some of the DML commands.
- DCL: Data Control Language grants permission and rights to the database controls. DCL commands include GRANT and Revoke.
- TCL: Transaction Control Language deals with all database transactions. Some TCL commands include ROLLBACK, COMMIT, and SAVEPOINT.
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