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. Read one concept.
- 2. Change the example.
- 3. Run, compare, and explain.
- 4. Complete the challenge below.
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.
Need a nudge?
Ask about this lesson or your next move. The guide explains the path without taking the work away from you.
Ready for the next lesson?
Mark this lesson complete when you have finished the exercise.
Loading editor…
Console