SQL INSERT, UPDATE, DELETE Explained | Beginner Guide to Modifying Data

Publicado el: 08 marzo 2026
en el canal de: CWM - Coding With Mike

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In this lesson, we move beyond reading data with SELECT and learn how to modify data in a database using SQL.

You'll learn the three core Data Manipulation Language (DML) commands:
INSERT – add new rows to a table
UPDATE – modify existing records
DELETE – remove rows from a table

Understanding these commands is essential for working with real databases because they change the actual data stored in your system.

We’ll walk through practical examples and discuss common mistakes — especially the dangers of running UPDATE or DELETE without a WHERE clause.

By the end of this lesson, you’ll understand how to safely modify data and why professional developers always verify rows with SELECT before changing them.

Topics Covered
What is Data Manipulation Language (DML)
SQL INSERT syntax and examples
Best practices when inserting data
SQL UPDATE with and without WHERE
SQL DELETE and common mistakes
Why SELECT before UPDATE/DELETE is a safe workflow
How transactions help protect your data

Example SQL Commands
INSERT INTO students (student_id, first_name, last_name, grade_level)
VALUES (1001, 'Maria', 'Santos', 11);

UPDATE students
SET grade_level = 12
WHERE student_id = 1001;

DELETE FROM students
WHERE student_id = 1003;
What You’ll Learn

✔ How to safely modify database records
✔ Why WHERE is critical when changing data
✔ The difference between INSERT, UPDATE, and DELETE
✔ Best practices used by professional developers

Chapters

00:00 Introduction
00:45 What is DML
02:10 INSERT Explained
05:00 UPDATE Explained
07:30 DELETE Explained
09:30 Common SQL Mistakes
11:00 Safe SQL Workflow
12:20 Summary

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