For those feeling overwhelmed by SQLD exam preparation, this is a standard course that analyzes the entire scope of the "Yellow Book," organizes the necessary theories through practice-oriented lessons, and solves every single problem. With short, concise clips and a topic-based structure, you can build the practical skills needed to succeed on the actual exam.
Reviews from Early Learners
5.0
MK
5.0
pantene74
I passed the SQLD! I put off studying and ended up preparing late, but this lecture allowed me to study efficiently in a short amount of time. Thank you for the great lecture~~
5.0
우냥
I am a student preparing for the SQLD exam. Thanks to you, I feel like I'm getting the hang of it. The lectures are easy to understand, and I like that the table of contents is well-organized, so I can listen to specific sections I'm struggling with. Also, your kind answers to my vague questions were very helpful. Thank you!
As you complete the entire scope of the "Noraengi" (Yellow Book), you will be able to solve problems together that were difficult to tackle alone.
Instead of a thick expert guide, you can reduce the learning burden by concisely summarizing only the necessary theories.
By solving problems through direct query execution in a hands-on environment, you can move beyond simple memorization and achieve understanding-based learning.
Thanks to the short and segmented lecture structure, you can selectively review only the parts you need and quickly wrap up your studies right before an exam.
"I heard it only takes a week, so I opened the 'Yellow Book'... but I got stuck from the very first page."
It's only natural.
People who say they passed in just a week are those who already have a foundation in SQL.
If you rush into a workbook without a solid foundation, you'll end up just memorizing the answers and getting questions wrong as soon as they are slightly modified.
Eventually, you even start thinking, "Maybe I just don't have a talent for SQL."
It is not a matter of talent.
The problem is trying to solve problems without first going through the process of writing basic syntax yourself.
Our course starts with executing each line yourself and visually confirming the results, from what SELECT is to how WHERE works.
Instead of just reading through the theory, you will repeat the process of writing every concept as a query, executing it, and verifying the results.
Once you build a foundation like this, you will start to be able to read the "Noraengi" (Yellow Book) problems. You will begin to see, "Ah, so this is what this question is asking."
1. From basic grammar to the exam scope, without any gaps
From SELECT, WHERE, and GROUP BY to JOIN, subqueries, and window functions. We build your foundation step-by-step from the very beginning, without skipping any sections by assuming "you probably already know this."
2. Learn all concepts by executing them yourself
We don't just stop at listening to explanations. You will directly write and execute queries for every concept. We even recreate problems from the "Yellow Book" (SQLD study guide) through hands-on practice, helping you grasp the examiner's intent and master standard solution routines.
3. Practice immediately without installation
We provide a Web SQL Lab exclusively for the course.
You can write queries immediately by simply opening your browser, without the need for Oracle installation or environment setup.
It includes an SQL editor, window function visualization, and an ERD schema viewer.
4. Short clips, a structure for selective review
It is divided into short segments by concept and problem.
You can pick and choose only the parts you need to rewatch, and quickly skim through them right before the exam.
First-time students who opened the "Yellow Book" first
"They said it only takes a week, so I started solving the workbook right away, but I don't understand a single word from the very first page."
Practice abandoners who stopped at environment setup
"I gave up because I ran into errors while installing Oracle. In the end, I never even got to try the hands-on practice."
Examinees who failed and are starting over
"I studied in my own way but failed. This time, I want to get a firm grasp on it."
You will become familiar with basic SQL syntax.
The exam scope can be understood at a glance.
You will start to understand the "Noraengi" (Yellow Book) problems.
You will gain the confidence of having covered the entire scope.
Ttatji - A researcher who loves to nitpick
I have used SQL every day while building data pipelines in practice.
As a language designed by mathematicians, SQL is a clean and complete language the more you get to know it. I created this course because I wanted to share that enjoyment with those preparing for the exam.
Thanks to my personality of questioning "Why does this work this way?" until the very end, I make sure to point out the details that students often overlook.
Web SQL Lab — Practice directly in your browser without any installation
Query Script
Summary Guide
Problem analysis materials
Website
Query script
Summary Booklet
Problem Analysis Materials
Who is this course right for?
Office workers who use SQL but feel overwhelmed by exam preparation
College students or job seekers learning SQL for the first time
An examinee exhausted from solving the "Noraengi" (Yellow Book) alone.
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Hello. I am Ddatg, a data analyst who loves to scrutinize the details.
Email: coddat.g@gmail.com
LinkedIn: http://www.linkedin.com/in/ddatg
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242 lectures ∙ (8hr 38min)
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87 reviews
4.8
87 reviews
Reviews 2
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Average Rating 5.0
5
In the settings, more detailed instructions are needed for Windows users. However, the instructor helped me directly, so I was able to solve it well. I think there must be people like me, so it would be good to reorganize the settings manual. Since then, I have been listening to the lecture while practicing with Debiber, and I am satisfied with the lecture.
Levi! Thank you for trying and following along persistently even though the Windows environment settings guide was insufficient. I think it would be better to make a video guide for that part.. I will try to improve it as soon as possible. Thank you for leaving a review. I hope you study hard and pass the certification ;)
Reviews 1
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Average Rating 5.0
5
The lecture structure is so good If you understand and follow the previous lectures well, you will have no problem understanding the next lectures If you follow it well until the end, you will be familiar with most of the problems The table of contents is also well-divided, so even if you only look at the table of contents after taking the class, - Oh, what was this about..? (click) - Oh, I know this It was so helpful in identifying weak points and saving review time, and on the day of the test. I feel like I got good results
bin2688, thank you for leaving a review. Above all, I am happy with this review because I think the intention of planning and creating the lecture was well conveyed. 🥰🥰🥰🥰 I think you probably passed since you listened to the lecture diligently and reviewed it well. 🎉🎉🎉 I hope you get good results ;)
Reviews 3
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Average Rating 5.0
5
This is a great lecture that helps a lot when you are preparing for SQLD by just reading yellow books as a non-major.
Hello 🙇♂️ It brings me great fulfillment as an instructor to hear that this has been especially helpful for those without a technical background 😊 If I was able to make your overwhelming preparation even a little bit easier, that would be my greatest joy 🎉📘 Thank you!
Reviews 4
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Average Rating 5.0
5
I sold ducks that year of all years :D
Haha.. what the heck happened that year!
Reviews 1
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Average Rating 5.0
5
Wow… To think you'd leave such an amazing review - as an instructor, I truly feel like I've received a wonderful gift 🙏 This review seemed to provide even deeper insights into my course than I had myself, which was so moving, and because I wanted to write a thoughtful reply, I ended up being way too late 😂 As you mentioned, I believe the SQLD exam isn't simply a "memorization test," but rather the core is the process of directly writing queries to discover and internalize the rules. You pinpointed this exactly, which made me reflect on my own course again. Especially the part where you didn't just memorize rules like 'having-group by-select-order by' but understood and internalized why they work that way - I think that's the most fundamental attitude toward SQL. Starting from no background, overcoming the overwhelming feeling through practice, and finally achieving the success of passing - that's truly an amazing journey 🎉 I sincerely hope that this passing experience will serve as a solid foundation not only for SQL but also for data analysis and your overall career going forward 🚀
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