SQLmate - SQLD 자격증 합격 도우미

DayLab

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About this app

SQLD Learning That You Won't Forget. How you review, rather than how many problems you solve, determines your success.

SQLmate is not just an app that increases the number of problems. It focuses on pinpointing your current weaknesses and bringing you back problems you've already solved just before you forget them. Because the cognitive science-based FSRS algorithm analyzes the forgetting curve for each problem to automatically determine the optimal review time, the amount of information retained differs significantly even with the same amount of time invested.

[Key Features]

Concept Learning

If you feel overwhelmed by the task of solving problems, start by reviewing the concepts. The entire range of SQLD is divided into 135 lessons for sequential learning, and you can immediately verify your understanding of learned concepts through practice problems.

4,325 Problems, Entire SQLD Range

From understanding data modeling to SQL basics and applications. Produced in-house to reflect KDATA's official exam standards.

Detailed Explanations

Explanations are provided for every problem. You can move on without simply checking the answer, understanding the concepts behind why that answer is correct. While in-depth detailed explanations are a premium feature, you can open them for free the first five times to check them out yourself.

SQL Practice Area

You can skip directly from the explanation and run the query for the problem yourself. The problem table is already uploaded, so it opens in your browser without installation or login. Try changing the conditions to see how the results change.

Various Solution Modes

You can choose to solve problems by subject or chapter. You can start with unsolved problems or gather only your weak chapters to focus on. A chapter-by-chapter shuffle mode that mixes problems from all subjects is also provided for free.

FSRS Smart Review

It extends the review interval for questions you answer correctly and quickly shows you frequently missed questions again. You don't need to create a review schedule yourself; the app takes care of the problems you need to review today.

Review Notifications

With daily study reminders and FSRS review time notifications, it helps you maintain your study flow so you can revisit them just when you are about to forget.

Weakness Analysis Heatmap

View the correct answer rate for each specific chapter at a glance. You can identify your weak areas by color and move directly to the solutions for that chapter.

**Incorrect Answer Notes and Review Box**
Gather your incorrect answers and questions to review in one place. You can review by grouping them by cause, such as trap types, SQL syntax, or out-of-range errors, and leave your own notes for each question.

**Practical Mock Tests**
We provide 10 sets of 50-question, 90-minute tests, just like the actual exam. Scoring is based on a passing score, and your highest score and test history are managed.

**Learning Statistics and Continuous Study**
Check your daily problem-solving count, accuracy trends, and continuous study days in real-time. Records that accumulate little by little every day help build consistency.

**Exam Schedule D-Day**
Check the upcoming SQLD exam schedule directly from the home screen.

**Light & Dark Themes**
You can follow system settings or choose your own, ensuring comfortable viewing even when studying late at night.

**Tablet Support**
You can study comfortably on tablets as well as mobile phones with a layout optimized for large screens.

**Offline Study**
You can solve problems even without an internet connection. Study without interruption, even on the subway or airplane.

[Content Guide]

SQLmate does not include past exam questions. This is because actual SQLD exam questions are not publicly disclosed, and the copyright for past questions belongs to the administering body, the Korea Data Industry Promotion Agency (KDATA); therefore, copying and pasting them as is is not permitted. Instead, we have analyzed KDATA's question standards and created study questions tailored to the format and difficulty level of the actual exam. The questions are composed of core question types with a high probability of appearing on the exam, and we do not restore or duplicate past questions. This is a tool to aid your learning and does not guarantee passing.

This app is an independent private learning tool designed to assist with SQLD study and is not affiliated with or representative of any government or public institution, such as the Korea Data Industry Promotion Agency (KDATA).

[Recommended for]

Those preparing for SQLD for the first time

Job seekers and office workers aiming to pass through self-study

Those preparing for the next certification after passing the Information Processing Engineer certification

Those preparing for data-related careers as non-computer science majors

Those who want to study briefly using their commute time

[Terms and Conditions]

Terms of Use: https://dayprep.co/sqlmate/terms

Privacy Policy: https://dayprep.co/sqlmate/privacy

(c) 2026 DAYLAB, [e-mail]

What’s new

• 학습 탭이 새로 생겼어요. 개념을 순서대로 익히고 바로 문제로 확인할 수 있어요.
• 문제가 1,099개에서 4,325개로 늘었어요.
• 모의고사 10세트가 추가되었어요.