SQL is the language that powers data management, and mastering its core commands is essential for anyone working with databases. Let’s break them down into five main categories:
✅ DQL (Data Query Language): Retrieve data from databases using commands like:
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SELECT— Extract specific data from tables. -
WHERE— Filter records based on conditions. -
JOIN— Combine rows from multiple tables.
✅ DML (Data Manipulation Language): Modify data with commands such as:
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INSERT— Add new records. -
UPDATE— Modify existing records. -
DELETE— Remove records.
✅ DDL (Data Definition Language): Define and manage database structures:
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CREATE— Add new tables or databases. -
ALTER— Modify table structures. -
DROP— Remove tables or databases.
✅ DCL (Data Control Language): Control access to the database with:
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GRANT— Provide specific privileges to users. -
REVOKE— Remove previously granted privileges.
✅ TCL (Transaction Control Language): Manage transactions to maintain data integrity:
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COMMIT— Save changes permanently. -
ROLLBACK— Undo changes if an error occurs.
Mastering these commands gives you the power to handle data efficiently, ensuring your applications run smoothly and securely. 🚀
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