SQL > SQL Commands

In this section, we discuss the following SQL commands, which are frequently used in SQL queries. By the end of this section, you will learn the basics of retrieving data from the database using SQL.

SQL commands are the fundamental instructions used to interact with relational databases. Mastering commands like SELECT, WHERE, GROUP BY, and ORDER BY gives you the foundation to retrieve and manipulate data effectively.

Frequently Asked Questions

What are the most commonly used SQL commands?
The most commonly used SQL commands include SELECT (to retrieve data), WHERE (to filter rows), GROUP BY (to aggregate data), ORDER BY (to sort results), and INSERT INTO / UPDATE / DELETE (to modify data).
What is the difference between DDL and DML commands in SQL?
DDL (Data Definition Language) commands such as CREATE, DROP, and ALTER define the structure of the database. DML (Data Manipulation Language) commands such as SELECT, INSERT, UPDATE, and DELETE operate on the data within those structures.
How do I filter results in a SQL query?
Use the WHERE clause to filter results. You can combine multiple conditions using AND and OR operators, and use IN or BETWEEN for range checks.
What is the ORDER BY clause used for?
The ORDER BY clause sorts query results by one or more columns in ascending (ASC) or descending (DESC) order.

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This page was last updated on March 19, 2026.



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