SQLmate - SQLD 자격증 합격 도우미

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]

1,099 Problems, Full Range of SQLD

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 just checking the answer, understanding the concepts behind why that answer is correct. While the in-depth detailed explanations are a premium feature, you can access them for free the first five times to check them yourself.

Various Solution Modes

You can choose to solve problems by subject or chapter. You can start with unsolved problems or gather specific chapters to focus on. We also offer a free "Unit-by-Unit Shuffle" mode that mixes questions from all subjects.

FSRS Smart Review

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

Review Notifications

With daily study reminders and FSRS review timing alerts, it helps maintain your study flow so you can revisit the material just as you might forget.

Weakness Analysis Heatmap

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

Incorrect Answer Notes and Review Box

Gather your incorrect answers and questions to review in one place. You can group and review by cause—such as trap types, SQL syntax, or out-of-range errors—and leave your own notes for each question.

Real Mock Tests

50 questions in a 90-minute format identical to 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 each day help build consistency.

Exam Schedule D-Day

Check upcoming SQLD exam schedules directly on 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

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 subways or airplanes.

[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 to create 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 aid in SQLD study and is not affiliated with or represented by 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-majors

Those who want to study briefly using their commute time

[Terms and Conditions]

Terms of Use: https://sqlmate.daylab.dev/terms

Privacy Policy: https://sqlmate.daylab.dev/privacy

(c) 2026 DAYLAB, contact@daylab.dev