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[CS Technical Interview 4] Database that gets you talking

A course that helps you understand core database concepts and trains you to explain them verbally in interviews.

(4.9) 18 reviews

419 learners

Level Beginner

Course period Unlimited

SQL
SQL
DBMS/RDBMS
DBMS/RDBMS
Tech Interview
Tech Interview
SQL
SQL
DBMS/RDBMS
DBMS/RDBMS
Tech Interview
Tech Interview

Reviews from Early Learners

4.9

5.0

KJH

100% enrolled

You did a great job highlighting the key points within the short lecture time, which was very helpful. I really like how you always summarize everything once more at the end. Thank you.

5.0

든든한꼬마

100% enrolled

I knew how important databases are for developers, but I always found it boring whenever I studied the theory in this field. Yongjun's lecture explained the core database theory concisely and clearly, allowing me to learn with interest. The explanations through real-world examples were a great help in understanding the theory intuitively! I'm also taking the SQLD exam soon, and I think this will be very helpful for exam preparation as well. Thank you for the great lecture.

5.0

인섭

83% enrolled

It was great that you covered not only simple SQL syntax but also transactions and permissions. Especially when talking about databases, you can't leave out indexes, and it was a substantial lecture since it included discussions about indexes as well.

What you will gain after the course

  • Understanding Core Database Concepts

  • The ability to explain verbally in technical interviews

  • Practical Workbook PDF for Preparing for Follow-up Questions

Have you ever had an experience like this 🥲 in an interview?

1. When answering with confused concepts

❓Interviewer What are the characteristics of object-oriented programming?
💬 Candidate It is the SOLID principles. First, S stands for...(omitted)...

This is a situation where the characteristics of object-oriented programming (abstraction, encapsulation, inheritance, polymorphism) and
the object-oriented design principles (SOLID) are confused.
This can give the impression that the framework of basic concepts has not been established.

2. Knowing only the "What" but failing to explain the "How" or "Why"

❓Interviewer: What are the characteristics of TCP?
💬 Candidate: It is a protocol that guarantees reliability.
❓ Interviewer: What are the mechanisms that guarantee reliability?
💬 Candidate: Uh... well... it's like... making sure it's transmitted safely... and...

This is a state where you only know the superficial definition and are not prepared to explain the principles.
If the 3-way handshake, sequence numbers, ACK, retransmission, flow control, and congestion control are
not connected as a single flow, you will inevitably get stuck on follow-up questions.

3. When you get stuck on basic questions

❓Interviewer: What is HTTP?
💬 Candidate: Uh... it's like... for sending and receiving data on the web...?

It is a very familiar concept, but when you actually try to explain it in a single sentence, the words don't come out.
This is not a lack of knowledge, but a lack of experience in organizing and speaking it aloud.


Knowing it is not enough. It only becomes a true skill when you can explain it in words.

🔥 So, this is how we structured it.

✦ Next-level, Premium Content for Interview Preparation

1⃣ CS Notes organized specifically for interview preparation

  • Concepts and principles that must be checked before an interview are gathered together and provided as lecture materials.

  • While filling in the fundamentals, it is structured so that you can keep coming back to it until right before your interview.

  • It is not just a simple summary, but includes diagrams and easy explanations so that even non-majors can fully understand it.


Example of Computer Architecture Lecture Materials

2⃣ Appendix | Interview practice materials provided

  • In an interview, the ability to explain clearly is much more important than simply knowing the information.

  • However, organizing and practicing on your own is a difficult and tedious task.

  • At the end of the lecture materials, we have included "answering in one or two sentences" training to save you the trouble of organizing it yourself.


Example of Database Lecture Appendix

3⃣ Preparing for follow-up questions  Technical Interview Practice Workbook PDF provided

  • "Will this lecture alone really be enough for speaking practice?"
    After much deliberation,

    I have created a technical interview practical workbook.

  • It is designed so that you can practice speaking just like a real interview even on your own.

  • You can find detailed information about the workbook's structure and how to use it in the workbook introduction video at the beginning of the course.

Operating System Workbook Example

4⃣ A course that keeps growing with a single purchase

  • This course is provided with unlimited access.

  • The content will continue to expand with new supplementary explanations, additional examples, and more.

  • Even if the price increases as content is added, students who have already purchased the course
    can access all content at no additional cost.

  • It is a CS guidebook that you can return to and consult whenever needed.

💡 How to make the most of this abundant content

1⃣ Download the materials and learn the core concepts while listening to the lectures.
2⃣ Take your own notes on the important parts to create your own CS interview notes.
3⃣ Save them on your phone and review them briefly whenever you have a spare moment.

Before an interview,
If you are short on time → Quickly sharpen your interview senses with the Appendix [Interview Practice] in the lecture materials.
If you have time → Complete your speaking practice as if it were a real interview using the Technical Interview Practical Workbook.

🎯 Recommended for the following people

Non-majors, job seekers, career changers, etc., who are preparing for technical interviews and need to be able to explain CS fundamentals verbally

CS majors who need to review and reorganize

I've studied it before, but
I don't know where to start organizing all that CS knowledge

Don't open those thick textbooks
again.
We will clearly summarize only the core essentials.

Non-majors who feel overwhelmed by CS

I'm preparing for a technical interview for the
first time, and I'm overwhelmed with
where to start

By following the roadmap,
you can focus on learning
only the key CS core concepts.

Job seekers looking to change careers with limited time

Forget that, I don't have much time.
I need to quickly review only the CS topics
that actually appear in interviews.

There are lecture materials and interview chapters that allow for
quick review
even on your own.

🔥 Reviews from students who experienced it first

A truly helpful course.
Already proven by 5,000+ students.

⭐️⭐️⭐️⭐️⭐️

1. A lecture where you can see how much the author has thought and agonized from the student's perspective (it seems the flow of the learner's understanding was well-considered)
2. Understanding is easy thanks to the variety of visual aids and examples
3. When learning new knowledge, the author connects it by mentioning and reminding you of previously learned content. As the knowledge connects, the big picture is drawn.
4. The depth of knowledge is not shallow. I'm taking the Operating Systems course right after Computer Architecture, and the synergy is great.
5. It perfectly scratches the itch of wondering "why" & "why we use it."
ps. I'm sorry to the author, but.. it's a lecture I want to keep all to myself.

-'Operating Systems' Course Review

⭐️⭐️⭐️⭐️⭐️

Even though the lecture time is short, I really like how the important parts are explained clearly. Since it focuses on theory, I didn't expect SQL queries to be covered, but I loved how the basic syntax and query writing were taught with step-by-step examples. After that, the sections on joins, normalization, transactions, indexes, data optimization, and security were excellent. While I haven't taken other paid courses yet, the final lecture appendix titled "Interview Practice" provided actual questions and answers, making it great for self-study and practice. The lecture time isn't too long if you stay focused, so I think I'll watch it a few more times. Thank you.

- 'Database' Course Review

⭐️⭐️⭐️⭐️⭐️

The core content was explained so clearly and with such a logical flow that it helped me quickly organize my understanding of data structures. Thank you for the great lecture.

- 'Data Structures' Course Review

⭐️⭐️⭐️⭐️⭐️

Wow... this is seriously so good...;;;; I need to save up and buy the whole roadmap.. I'm curious if you have any plans to teach Spring as well.. I'll buy it immediately..

-'Java and Object-Orientation' Course Review

⭐️⭐️⭐️⭐️⭐️

This is a lecture where you can organize the key concepts of JavaScript all at once by setting aside about a day! It's great for a quick reminder before an interview👍



- 'JavaScript' Course Review

⭐️⭐️⭐️⭐️⭐️

As a non-computer science major, I was worried about how to study CS knowledge, especially computer architecture and operating systems. However, the content was divided into appropriate amounts, so I could learn without feeling overwhelmed, and it was great because it felt like getting private tutoring from an expert. I plan to take the operating system lecture as well, and I'm looking forward to it. Thank you!

- 'Computer Architecture' Course Review

🖐 Hello! Let me introduce myself! 🙇

As someone from a non-major background, I initially focused solely on algorithms and coding tests while preparing for my first developer job.
I gained a fair amount of confidence and passed most coding tests, but I continued to fail at the next hurdle: the technical interview. What was the problem? It was the lack of CS (Computer Science) knowledge.

I understand the thirst for fundamental skills (CS knowledge, programming languages, etc.) better than anyone. I built my own know-how by digging through countless materials on my own, and after graduating from Seoul National University, I am now working as a 🧑🏻‍💻 Kakao Developer.

Since I was young, I have been more confident than anyone else in combining and restructuring various materials to create my own 'consolidated notes.' This lecture is the secret notebook that contains all that know-how and passion.

🚀 The fourth subject of the Fluent CS Series is Database.

  • Do you find it hard to remember transaction isolation levels and the specific problems each level solves?

  • Have you been getting by with just a vague understanding that sharding is vertical and partitioning is horizontal splitting?

  • Or do you know that indexes are good for performance, but find their complex structure and operating principles still confusing?

📖 Curriculum packed with only the essentials

These are the table of contents and key keywords you will learn in this course.

If there are any unfamiliar keywords, take this opportunity to master them once and for all.

  1. Database Overview

    • Database characteristics, RDBMS, database modeling

  2. Handling SQL

    • SQL Basic CRUD, Aggregate Functions, Subqueries, SQL Joins, Paging, NoSQL

  3. Normalization

    • Anomalies, various normalization stages (1NF~3NF)

  4. Transaction

    • ACID, transaction states, transaction recovery, transaction isolation levels (Level 1 to Level 4)

  5. Index and Data Optimization

    • Index types and data structures (B-Tree, B+Tree), composite indexes, sharding, and partitioning

  6. Database Security

    • User privilege management, SQL injection defense

  7. [Appendix] Interview Practice

    • Reviewing key concepts once more in a Q&A format

✏ Here is what we will cover

1⃣Database Fundamentals Summary for Both Practical Work and Interviews

  • Summarizing core concepts such as SQL, normalization, transactions, indexes, sharding, and security in a logical flow.

  • Designed with a focus on the context of concepts (why these features were created)

강의 상세 목차

Detailed Course Syllabus

2⃣ 'Knowing the 'Why' of SQL: Learning Core Syntax and Principles

  • Beyond simply listing SQL syntax, you will learn the significance of core SQL concepts, such as why we use JOIN and GROUP BY in what situations they are necessary.

  • You will clearly understand the context of how SQL syntax frequently used in practice is applied, ranging from basic SELECT, INSERT, UPDATE, and DELETE to complex JOIN, subqueries, and paging queries.

Inner Join 과정

Inner Join Process

SQL 기본 문법 예시

SQL Basic Syntax Examples

SQL 고급 문법 예시

Examples of advanced SQL syntax

3⃣Easily explain confusing DB concepts (transactions, normalization, indexes, etc.) using diagram-centered explanations

  • You will clearly understand the characteristics of each isolation level, each stage of normalization (1st, 2nd, 3rd normalization), and anomalies that many beginners struggle with, as well as the complex data structures (B+Tree) and operating principles of indexes, through intuitive diagrams and visual materials instead of complex text.

  • We help you understand and remember each concept for a long time by allowing you to grasp at a glance through illustrations why they are necessary, what problems they solve, and how they impact actual performance.

인덱스의 B+tree 자료구조

B+tree data structure of an index

이상 현상 예시

Examples of anomalies

트랜잭션 격리 수준 예시

Examples of transaction isolation levels

👀 Course Preview

If the video is frozen, please refresh the page :)

Explanation of the DB modeling process

Explanation of Transaction Isolation Levels 1 to 4

말이트이는 CS 시리즈

Notes before taking the course

  • Format of learning materials provided: PDF

Recommended for
these people

Who is this course right for?

  • A non-major who feels overwhelmed because it's their first time studying CS

  • Computer science students who need to organize CS concepts before a technical interview

  • Job seekers preparing for a career change who are short on time ahead of a technical interview

Hello
This is yiyj10305235

Inflearn Verified

Career Verified

5,421

Learners

224

Reviews

32

Answers

4.9

Rating

7

Courses

Education and Experience

  • Graduate of Seoul National University

  • Current Kakao Server Developer

    Course Introduction I am creating the "Fluent CS" series to help you articulate CS concepts during interviews. Course Philosophy Having started development as a non-computer science major, I understand the importance of CS...

Course Introduction I am creating the "CS for Speaking" series to help you articulate CS concepts during interviews. Course Philosophy Having started development as a non-computer science major, I...

Course Introduction

I am creating the
CS Speaking series to help you articulate CS concepts during interviews.

Teaching Philosophy

I started my development career as a non-CS major and went through a lot of trial and error while personally organizing everything from CS fundamentals to technical interviews. Based on the learning methods and conceptual organization know-how accumulated through that process, I create content that makes core concepts encountered in practice and interviews easy to understand through illustrations.
"I am creating the lectures that I needed back then."

Blog yiyj1030.tistory.com → Running a tech blog that simplifies CS, algorithms, and practical concepts. Contact yiyj1030@gmail.com

Blog

  • yiyj1030.tistory.com
    → Running a tech blog that simplifies and organizes CS, algorithms, and practical concepts

Contact

yiyj1030@gmail.com

More

Curriculum

All

32 lectures ∙ (3hr 19min)

Course Materials:

Lecture resources
Published: 
Last updated: 

Reviews

All

18 reviews

4.9

18 reviews

  • koelkorea7927님의 프로필 이미지
    koelkorea7927

    Reviews 18

    ∙

    Average Rating 5.0

    5

    42% enrolled

    Since databases are used by everyone in the field, it's not easy for non-majors to try to find, study, and organize the basics, and many lectures are burdensomely expensive... This course solves all those dilemmas while remaining affordable. I especially want to recommend this to anyone curious about DB basics because it selects the core theoretical fundamentals rather than just practical work and organizes them like a set of notes.

    • leeseongmin님의 프로필 이미지
      leeseongmin

      Reviews 4

      ∙

      Average Rating 5.0

      5

      31% enrolled

      I like it

      • myhwc님의 프로필 이미지
        myhwc

        Reviews 3

        ∙

        Average Rating 5.0

        5

        83% enrolled

        It was great that you covered not only simple SQL syntax but also transactions and permissions. Especially when talking about databases, you can't leave out indexes, and it was a substantial lecture since it included discussions about indexes as well.

        • yiyj10305235
          Instructor

          Thank you for the course review. I hope this lecture isn't the end and that we can continue the learning journey together. I look forward to seeing you again in the next series :)

      • yji09030350님의 프로필 이미지
        yji09030350

        Reviews 91

        ∙

        Average Rating 4.5

        5

        62% enrolled

        It is a great help in understanding DB.

        • junkim46857399님의 프로필 이미지
          junkim46857399

          Reviews 5

          ∙

          Average Rating 5.0

          5

          100% enrolled

          You did a great job highlighting the key points within the short lecture time, which was very helpful. I really like how you always summarize everything once more at the end. Thank you.

          • yiyj10305235
            Instructor

            Thank you for the course review. I hope this lecture isn't the end and that we can continue the learning journey together. I look forward to seeing you again in the next series :)

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