This is a problem-solving app for preparing for the SQLD (SQL Developer) certification. ■ 300 Questions, Covering the Entire Exam Scope
· Subject 1: Understanding Data Modeling, Subject 2: SQL Basics and Application
· Covers all 27 detailed topics without omission
· Questions are distributed according to the weighting of the actual exam
■ Explanations Verified by Execution
· Correct answers to SQL questions were verified by comparing the results after actually executing the queries
· Step-by-step solutions allow you to follow the process step-by-step to understand why the answer is correct
· Reasons for why an incorrect answer is wrong are provided for every incorrect answer
■ Focus on Common Pitfalls
· NULL handling, outer joins, GROUP BY, execution order, etc.
· Types of questions that "have no syntax errors but produce results different from the intended outcome" have been collected separately
■ Tools to Continue Learning
· Incorrect questions are automatically collected in the error notebook
· You can check the correct answer rate by topic and the predicted passing score
· A D-day is displayed when you set a target exam session
· Supports Dark Mode
■ Guide
Questions and explanations were written by AI based on the SQLD exam scope and verified by comparing them with SQL execution results. These are not official past exam questions, so there may be errors. If you find any errors, please report them via 'Report Question Errors' in the app settings.
Please check the Korea Data Industry Promotion Agency (KDATA) for exam schedules and official information.
SQLD 300 Questions. Step-by-step learning with explanations verified by directly executing SQL.