SQLDOU vs DS検定Pass
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
SQLDOU
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SQLDOU is an educational app that visualizes SQL query execution plans with step by step animation. The third entry in the DOU series, following PAKEDOU (networking) and KURAUDOU (cloud). This time the theme is SQL. Enter a query and watch the execution plan generate automatically, then follow each row as it flows through filtering, sorting, joining and finally arrives at the result. WHAT YOU WILL LEARN • Full Scan vs Index Why scanning every row (full scan) is slow. See how much faster a B Tree index makes searches. Run the same SQL with both scan methods and compare speed in real time. • B Tree Index O(log n) Supports range queries such as greater than, less than, greater than or equal, less than or equal and equality. Watch the tree structure locate target rows efficiently through animation. • Hash Index O(1) Pro A high speed index specialized for equality searches. Experience the real execution time difference between Hash and B Tree. • WHERE and DISTINCT See each row pass or get skipped by the WHERE condition in real time with PASS or SKIP badges. Observe DISTINCT removing duplicates step by step. • JOIN Pro Visualize how rows from two tables are combined. See the batch process that waits for both sides before executing the join. • GROUP BY and ORDER BY Pro Watch aggregation such as COUNT, SUM, AVG, MAX and MIN and sorting such as ASC and DESC animate their internal processing. Observe how they buffer all rows before producing output. • Custom Quiz Mode v3.0 Pro Define your own table name, columns and rows, write any SQL you want, and save the quiz. Replay or edit later. Go beyond textbook examples and reproduce real world scenarios you care about. 20 MISSIONS Progress through 20 missions across 6 levels. • Level 1 SELECT and WHERE 5 missions SQL fundamentals • Level 2 Scan Methods 4 missions Full scan vs index speed comparison • Level 3 ORDER BY and DISTINCT 3 missions Pro • Level 4 GROUP BY 3 missions Pro • Level 5 JOIN 2 missions Pro • Level 6 Final Challenge 3 missions Index optimization Pro Each mission includes a prediction quiz. The Predict Execute Verify cycle encourages active learning. Star ratings up to three track your progress. EDUCATIONAL FEEDBACK • Auto comparison run the same SQL with full scan and index and see the speed difference automatically • Scan narration watch each row being checked in real time with PASS or SKIP verdict • Diagnostic comments context aware explanations Pro Why slow How to improve Background knowledge • Table data preview see actual data while making predictions FREE AND PRO Free • Level 1 and Level 2 missions total 9 missions • Basic diagnostics one line comment • B Tree index • Free mode Pro one time purchase • All 20 missions unlocked • Detailed diagnostics Why How to improve Background • Hash index support • Advanced SQL JOIN GROUP BY ORDER BY DISTINCT • Custom Quiz Mode build save and run your own quizzes • No ads WHO IS THIS FOR • Students and junior engineers learning SQL basics • Anyone who wants to intuitively understand why indexes are fast • Database beginners learning execution plans • Instructors looking for training supplements • Developers building a foundation in SQL performance tuning
DS検定Pass
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DS検定Passは、データサイエンティスト検定 リテラシーレベルに向けて、データサイエンス力・データエンジニアリング力・価値創造スキル・基盤スキルをスマホで反復できる学習アプリです。 過去問の出題傾向と、公表されている試験・制度情報を踏まえた全600問を収録。統計、確率、回帰、分類、評価指標、データ前処理、可視化、SQL、データ基盤、価値創造、AI利活用、データ倫理など、幅広い範囲を4分野に分けて学習できます。 間違えた問題を優先して出題する復習、連続学習日数の記録、選択肢ごとの解説で、短時間でも理解を積み上げやすい構成にしています。 ■ 収録内容 ・データサイエンス力 220問 ・データエンジニアリング力 140問 ・価値創造スキル 140問 ・基盤スキル 100問 ■ 対象試験 データサイエンティスト検定 リテラシーレベル 試験方式: CBT 試験時間: 100分 問題数: 100問 出題形式: 四肢択一式 受験資格: 制限なし ■ 主な機能 ・4分野から選べる一問一答演習 ・100問の模試モード ・間違えた問題を優先する誤答優先学習 ・苦手問題のフラグと復習 ・選択肢ごとの解説 ・連続学習日数の記録 ・広告視聴による問題追加解放 ・文字サイズは標準、大、特大の3段階 ・サインイン不要、位置情報や連絡先の取得なし ■ 解説 正解の理由だけでなく、ほかの選択肢がなぜ違うのかも確認できます。 平均と中央値、相関と因果、適合率と再現率、データレイクとデータウェアハウスなど、近い概念の違いをその場で整理できます。 ■ 学習の流れ 1. 出題する分野を選ぶ 2. 10問、20問、模試100問、全問から出題数を選ぶ 3. 四肢から1つを選んで回答 4. 正誤判定と解説を確認 5. 分析画面で分野別の正答率を確認 6. 苦手問題や誤答優先で復習する ■ 無料で使える範囲 ・各分野の約20%の問題 ・回答と正誤判定 ・一言解説 ・誤答優先学習 ・連続学習日数の記録 ・広告視聴による問題追加解放 ■ プレミアム ・全問題にアクセス ・詳細解説と選択肢ごとの解説 ・苦手問題モード ・模試100問モード、全問モード ・広告非表示 ■ こんな方におすすめ ・DS検定を初めて受ける方 ・統計、機械学習、SQLを基礎から確認したい方 ・G検定やITパスポートの次にデータ活用を学びたい方 ・DX推進パスポートを意識して複数資格を学ぶ方 ・通勤時間や休憩時間に短く反復したい方 ■ 姉妹アプリ 生成AIパスポートPass、ITパスポートPass、G検定Passなど、AI・DX・データリテラシー領域の姉妹アプリも展開しています。 本アプリは一般社団法人データサイエンティスト協会のアプリではありません。
Screenshots
Verdict
The clearest difference is update cadence: DS検定Pass at every 6 days against SQLDOU's every 3 weeks. On price, ads, in-app purchases and device support there is nothing between them.
Scored on Price · Rating · Positive reviews · Number of ratings · Update frequency · Ads · In-app purchases · Monetization · Best chart rank · Devices · Requires iOS
Both are free to download. SQLDOU sells 1 one-off in-app purchase and DS検定Pass sells 1 one-off in-app purchase. Whichever you choose, the download price is not the number that matters.
SQLDOU ships an update every 3 weeks, DS検定Pass every 6 days. The most recent releases landed on September 18, 2026 and September 10, 2026 respectively.
| Parameter | SQLDOU | DS検定Pass |
|---|---|---|
| Price | Free | Free |
| Update frequency | Every 3 weeks | Every 6 days — better |
| Ads | Yes | Yes |
| In-app purchases | Yes | Yes |
| Devices | iPhone, iPad | iPhone, iPod |
| Requires iOS | 16.0 | 15.1 — better |
| Further details — not scored | ||
| Size | 10 MB | 41 MB |
| Age rating | 4+ | 4+ |
| Developer | Fuji Bit Inc. | KANDK |
In-app purchases
SQLDOU
- SQLDOU Pro$5.99
DS検定Pass
- プレミアムプラン$1.99







