Explain the five categories of SQL commands.

. SQL Commands are divided into five broad categories – DDL, DML, DCL, TCL, and DQL.

  1. DDL (Data Definition Language): These commands are used to define and manage database structures (tables, views, etc.). Examples:
    • CREATE: Creates a new table or database.
    • ALTER: Modifies an existing table structure.
    • DROP: Deletes a table or database.
  2. DML (Data Manipulation Language): These commands are used to manipulate data in the database (insert, update, delete). Examples:
    • INSERT: Adds new data to a table.
    • UPDATE: Modifies existing data in a table.
    • DELETE: Removes data from a table.
  3. DCL (Data Control Language): These commands control access to the data in the database (permissions). Examples:
    • GRANT: Gives users permission to perform actions.
    • REVOKE: Removes permissions from users.
  4. TCL (Transaction Control Language): These commands manage transactions, which are groups of SQL commands that are executed together. Examples:
    • COMMIT: Saves changes made by the current transaction.
    • ROLLBACK: Cancels changes made by the current transaction.
    • SAVEPOINT: Sets a point to which you can roll back.
  5. DQL (Data Query Language): These commands are used to query and retrieve data from the database. Example:
    • SELECT: Retrieves data from one or more tables.

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