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SQL Fundamentals · Updating & Deleting · Lesson 11 of 17

Deleting Rows

Concept

Deleting Rows

DELETE removes rows from a table. Like UPDATE, a missing WHERE clause means every row gets deleted.

By the end of this lesson
  • Explain the core idea behind Deleting Rows.
  • Predict output before running a change.
  • Test one realistic and one unusual input.
  • Use the result to make the next decision.
How to study this page
  1. 1. Read one concept.
  2. 2. Change the example.
  3. 3. Run, compare, and explain.
  4. 4. Complete the challenge below.
ExampleRunnable
DELETE FROM students
WHERE id = 2;
Try it Yourself »
Self-check before continuing

Without looking at the example, describe what changes when you modify one input in Deleting Rows. Then reopen the editor and prove your explanation with a small test.

You are ready to continue when you can predict, test, and explain the result.

Your turn

Write a DELETE statement that removes students younger than 18.

Loading editor…

Console

Output will appear here...