SQL Fundamentals · Inserting & Querying Data · Lesson 6 of 17
Filtering with WHERE
Concept
Filtering with WHERE
WHERE narrows a query down to only the rows that match a condition, using comparison operators just like other languages.
By the end of this lesson
- Explain the core idea behind Filtering with WHERE.
- 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 Filtering with WHERE. 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 query that selects students older than 21.
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.
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