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Turn your IT notes on SQL joins into practice quizzes

DeckOwl is not Gimkit and does not host live games. It writes multiple-choice, true/false and short answer questions with explanations from your PDFs, slides or notes.

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How the IT join quiz works

Most students searching for a Gimkit-style IT join quiz want to practice SQL joins before an exam, not run a live game. DeckOwl cannot join a Gimkit session, but it can turn your lecture slides on INNER, LEFT and FULL joins into questions with explanations you can study right away.

Multiple-choice, true/false and short answer questions from one upload
Explanations that show why a join keeps or drops a row
Flashcards with spaced repetition for join syntax
Free plan includes 3 generations per month and browser study

Example SQL join practice questions

What does an INNER JOIN return?Only rows where the join condition matches in both tables, because unmatched rows are dropped.

What extra rows does a LEFT JOIN return compared with an INNER JOIN?Every row from the left table, with NULL in the right-table columns when no match exists, because LEFT JOIN keeps unmatched left rows.

Does a FULL OUTER JOIN keep unmatched rows from both tables?Yes, because it keeps unmatched rows from each side and fills the missing columns with NULL.

What does a CROSS JOIN produce?Every row of one table paired with every row of the other, because it has no join condition to filter pairs.

Why can a join on a non-unique column return more rows than either table?Each matching pair of rows produces an output row, so duplicate keys on both sides multiply the results.

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Questions from your own material

Upload a PDF, DOCX, PPTX, plain text or a photo of a page, and get a question set based on what your instructor actually covered.

Explanations for every answer

Each question includes a short reason, so a wrong guess about how many rows a join returns teaches you the rule behind it.

Flashcards and quizzes together

Use spaced repetition flashcards for join syntax and quizzes for predicting results, all studied in the browser on the free plan.

How it works

Upload your join notes

Add slides, a PDF or typed notes covering INNER, LEFT, RIGHT, FULL OUTER and CROSS joins.

Choose question types

Pick multiple-choice, true/false or short answer questions and generate the set in one pass.

Study and export if your plan allows

Practice in the browser on the free plan, or export to PDF or DOCX on Plus and to QTI 2.1 or Moodle XML on Pro.

Each question shows the correct answer and a short reason, so a wrong guess about row counts becomes a lesson on how the join condition works. Paid plans add exports, with PDF and DOCX on Plus and QTI 2.1 and Moodle XML on Pro.

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Frequently asked questions

What is the difference between INNER JOIN and LEFT JOIN?

INNER JOIN returns only rows where the join condition matches in both tables. LEFT JOIN keeps every row from the left table and fills unmatched right-side columns with NULL.

How should I practice SQL joins before a test?

Work through small tables by hand and predict the row count for each join type before running the query. Check your predictions against the output, then repeat with a different join condition.

Can DeckOwl join a Gimkit game for me?

No. DeckOwl is a separate tool that does not host Gimkit games. It generates quiz questions from your notes that you can study in the browser.

Which exports come with paid plans?

Plus includes unlimited generations and exports such as PDF, DOCX, Anki and CSV. Pro adds QTI 2.1 and Moodle XML export, while the free plan has no exports.

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