Introduction to SQL | DDL, DML, DQL, DCL, TCL Commands in SQL

Introduction to SQL (Structured Query Language)
📌 SQL stands for Structured Query Language, which is the language used to interact with relational database software like Oracle, MySQL, and MS Access.
🌐 SQL is a simple English-like language, making it easy to use for passing queries and working with databases that store data in row and column formats.
📜 Guidelines for SQL were provided by the ANSI (American National Standards Institute) organization, and these standards have been accepted by major database vendors.

Categories of SQL Commands
📌 To reduce complexity, the SQL language is divided into five subcategories or command types.
📚 The first category is DDL (Data Definition Language), which includes five commands: CREATE, DROP (permanently deletes the table), TRUNCATE (deletes only table data, keeping the structure), ALTER, and RENAME.
💾 The second category is DML (Data Manipulation Language), which includes the INSERT, UPDATE, and DELETE queries used to manage the data within created tables.
🔍 The third category is DQL (Data Query Language), also known as Data Retrieval Language, which contains only the SELECT query used to view records stored in the database.

Database Control and Transaction Commands
🛡️ The fourth category is DCL (Data Control Language), which manages database control using the GRANT (to provide access permissions) and REVOKE (to take back granted permissions) commands.
🔄 The fifth subcategory is TCL (Transaction Control Language), which includes commands like COMMIT, ROLLBACK, and SAVEPOINT for managing database transactions.

Key Points & Insights
➡️ SQL is a language, not a database; it is utilized by relational databases like Oracle and MySQL to access and manipulate data.
➡️ The complexity of SQL was reduced by dividing its commands into five functional subcategories: DDL, DML, DQL, DCL, and TCL.
➡️ Future videos will provide practical demonstrations for every query within these five categories, including CREATE, INSERT, SELECT, GRANT, and COMMIT.

📸 Video summarized with SummaryTube.com on Mar 04, 2026, 00:29 UTC