SQL Exercises

Each SQL lesson has a fill-in-the-blank exercise. You complete a query with one or two missing tokens — and the grader checks the whole thing against the lesson's expected output.

How it works

• Read the instruction at the top.
• Click the blank, type your answer, and press Run.
• A wrong answer triggers a hint; the second wrong try shows the solution.

Why fill-in-the-blank

Recall is the strongest predictor of retention. The blanks are intentionally small so the cognitive load stays on the new concept.

Sample

-- Instruction: select every customer in Australia.
SELECT *
FROM customers
____ country = 'AU';

Answer: WHERE.

Where to go next

• Finish all 70+ SQL exercises to unlock the "Built it from blanks" badge.
• Try the SQL Bootcamp for daily challenges.
• Pair every exercise with the matching Try it Yourself » — small variations build intuition.

Example

-- Fill in the blank to complete the query:
SELECT *
FROM customers
____ country = 'AU';

Exercise

Test yourself