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First steps to SQL coding test

By solving Leetcode SQL problems, you can understand problem types and improve your SQL implementation skills in a short period of time.

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200 learners

Level Basic

Course period Unlimited

Coding Test
Coding Test
SQL
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MySQL
MySQL
Coding Test
Coding Test
SQL
SQL
MySQL
MySQL

News

13 articles

  • gemmadata님의 프로필 이미지

    Edited

    Hello everyone :)

    Since 2024, I've been running a free SQL coding test problem-solving class!
    I plan to continue it in the upcoming 2026 as well.
    However, this time I've simplified the process so you can apply by directly entering the open chat room.

    I need to translate the content between the `` tags, but I notice that the tags are empty. There is no Korean text provided between them to translate. The surrounding context shows: - Before: Text about continuing something in 2026 and simplifying the process through an open chat room - After: Text about not being accustomed to asking for help and admiring those who can request help without hesitation However, since there is no text between the `` tags, there is nothing for me to translate.

    Perhaps because I'm not used to asking for help myself, I find it truly admirable when people can request assistance without hesitation when they need it. Knowing exactly what you need and being able to express it honestly ultimately means you can view yourself objectively.

    Just by taking the course, you are already amazing people, so I hope all of you students will actively utilize the coding test problem-solving sessions to gain even more help.

    I notice that the `` tags are empty - there is no Korean text between them to translate. However, I can see Korean text in the `` section. Would you like me to translate those portions? If so, here they are: **Before:** "Just being able to do that already makes them amazing people, so I hope all of you students will actively utilize the coding test problem-solving class as well to gain even more help." **After:** "The open KakaoTalk room is at the link below, and if there are many applicants, it may be moved to the next month. https://open.kakao.com/o/sCGE8k0f Please refer to the process below" Please provide the Korean text you'd like translated between the `` tags.

    The open KakaoTalk chat room is at the link below, and if there are many applicants, it may be moved to the next month.

    https://open.kakao.com/o/sCGE8k0f

    I hope you find it helpful. The open chat room link is below, and if there are many applicants, it may be moved to the next month. https://open.kakao.com/o/sCGE8k0f

    Please refer to the details below for how it will be conducted.

    If you have any questions, please feel free to ask in the open KakaoTalk chat room anytime.


    [Duration] 4 weeks from the beginning of the month (4 sessions)

    [How it works]
    - I will share 3 problems in the open KakaoTalk room on Sundays.
    - Participants will secure uninterrupted time on any day between Monday and Saturday to solve the problems for 1 hour.
    - I will provide code feedback and share the next 3 problems on the following Sunday.

    [Schedule]
    Week 1 Sunday: (Gemma) Distribute week1 problems
    Week 1 Mon-Sat: (Participants) Solve week1 problems
    Week 2 Sunday: (Gemma) Week1 feedback and distribute week2 problems
    Week 2 Mon-Sat: (Participants) Solve week2 problems
    Week 3 Sunday: (Gemma) Week2 feedback and distribute week3 problems
    Week 3 Mon-Sat: (Participants) Solve week3 problems
    Week 4 Sunday: (Gemma) Week3 feedback and distribute week4 problems
    Week 4 Mon-Sat: (Participants) Solve week4 problems
    Week 5 Sunday: (Gemma) Week4 feedback

    0
  • gemmadata님의 프로필 이미지

    hello everyone :)

    [Permanent] We are recruiting for the 2025 SQL Coding Test Problem Solving Class .

    This problem-solving class is free and will be conducted based on those who apply through the survey link.

    (If there are many applicants in a particular month, it may be carried over to the next month.)

    https://forms.gle/14iJDdvjsxUg3JMXA

    Please refer to the following for the progress.

    If you have any questions, please feel free to ask in the comments.


    [Deadline] 4 weeks (4 times) from the beginning of the month

    [How to proceed]
    - I will share three problems in an open KakaoTalk room on Sunday.
    - Participants will work on the problem for one hour on any day from Monday to Saturday without interruption.
    - I'll share the code feedback and the next 3 issues on Sunday when I return.

    [schedule]
    Week 1: (Gemma) Week 1 Problem Distribution
    Week 1 Mon-Sat: (Participants) Solve week1 problems
    Week 2: (Gemma) Week 1 feedback and week 2 problem distribution
    Week 2 Mon-Sat: (Participants) Week 2 Problem Solving
    Week 3: (Gemma) Week 2 feedback and week 3 problem distribution
    Week 3 Mon-Sat: (Participants) Week 3 Problem Solving
    Week 4: (Gemma) Week 3 feedback and week 4 problem distribution
    Week 4 Mon-Sat: (Participants) Week 4 Problem Solving
    Week 5: (Gemma) week4 feedback

    0
  • gemmadata님의 프로필 이미지

    The December problem-solving class is first-come, first-served and has already closed .

    We are planning to recruit continuously in 2025 , so if you are interested, please apply in advance through the Google form! We will contact you separately via the email address you provided.


    hello everyone :)

    [12th] We are looking to recruit for the SQL coding test problem solving class .

    It will be free every month until 2024 .

     

    Since it is a first-come , first-served basis, we will proceed based on the person who sends the survey link first. (Anyone other than the first 1 person will be transferred to the waiting list for the next month.)

    https://forms.gle/14iJDdvjsxUg3JMXA

    Please refer to the following for the progress.

    If you have any questions, please feel free to ask in the comments.


    [Persons] 1 person on a first-come, first-served basis

    (Anyone other than the first 1 person will be transferred to the waiting list for the next month)

    [Deadline] 2024/12/2 (Mon) ~ 12/28 (Sat) (4 times)

    [How to proceed]

    - I will share three problems in an open KakaoTalk room on Sunday.

    - Participants will work on the problem for one hour on any day from Monday to Saturday without interruption.

    - I'll share the code feedback and the next 3 issues on Sunday when I return.

    [schedule]

    12/1: (Gemma) Week 1 problem distribution

    12/2-12/7: (Participants) Week 1 Problem Solving

    12/8: (Gemma) Week 1 feedback and week 2 problem distribution

    12/9-12/14: (Participants) Week 2 Problem Solving

    12/15: (Gemma) Week 2 feedback and week 3 problem distribution

    12/16-12.21: (Participants) Week 3 Problem Solving

    12/22: (Gemma) Week 3 feedback and week 4 problem distribution

    12/23-12/28: (Participants) Week 4 Problem Solving

    12/29: (Gemma) week4 feedback

    0
  • gemmadata님의 프로필 이미지

    Edited

    The November problem-solving class has ended .

    We are planning to recruit again at the end of November , so if you are interested, please apply in advance through the Google form! We will contact you separately via the email address you provided.


    hello everyone :)

    [11th] We are looking to recruit for the SQL coding test problem solving class .

    It will be free every month through 2024 .

     

    Since it is a first-come , first-served basis, we will proceed based on the person who sends the survey link first. (Anyone other than the first 1 person will be transferred to the waiting list for the next month.)

    https://forms.gle/14iJDdvjsxUg3JMXA

    Please refer to the following for the progress.

    If you have any questions, please feel free to ask in the comments.


    [Persons] 1 person on a first-come, first-served basis

    (Anyone other than the first 1 person will be transferred to the waiting list for the next month)

    [Deadline] 2024/11/4 (Mon) ~ 11/30 (Sat) (4 times)

    [How to proceed]

    - I will share three problems in an open KakaoTalk room on Sunday.

    - Participants will work on the problem for one hour on any day from Monday to Saturday without interruption.

    - I'll share the code feedback and the next 3 issues on Sunday when I return.

    [schedule]

    11/3: (Gemma) Week 1 problem distribution

    11/4~11/9: (Participants) Week 1 Problem Solving

    11/10: (Gemma) Week 1 feedback and week 2 issue distribution

    11/11~11/16: (Participants) Week 2 Problem Solving

    11/17: (Gemma) Week 2 feedback and week 3 problem distribution

    11/18~11/23: (Participants) Week 3 Problem Solving

    11/24: (Gemma) Week 3 feedback and week 4 issue distribution

    11/25~11/30: (Participants) Week 4 Problem Solving

    12/1: (Gemma) week4 feedback

    0
  • gemmadata님의 프로필 이미지

    Edited

    The October problem-solving class has ended .

    We are planning to recruit again at the end of October , so if you are interested, please apply in advance through the Google form! We will contact you separately via the email address you provided.


    hello everyone :)

    [10th] We are looking to recruit for the SQL coding test problem solving class .

    It will be free every month through 2024 .

     

    Since it is a first-come , first-served basis, we will proceed based on the person who sends the survey link first. (Anyone other than the first 1 person will be transferred to the waiting list for the next month.)

    https://forms.gle/14iJDdvjsxUg3JMXA

    Please refer to the following for the progress.

    If you have any questions, please feel free to ask in the comments.


    [Persons] 1 person on a first-come, first-served basis

    (Anyone other than the first 1 person will be transferred to the waiting list for the next month)

    [Deadline] 2024/9/30(Mon)~10/26(Sat) (4 times)

    [How to proceed]

    - I will share three problems in an open KakaoTalk room on Sunday.

    - Participants will work on the problem for one hour on any day from Monday to Saturday without interruption.

    - I'll share the code feedback and the next 3 issues on Sunday when I return.

    [schedule]

    9/29: (Gemma) Week 1 problem distribution

    9/30~10/5: (Participants) Week 1 Problem Solving

    10/6: (Gemma) Week 1 feedback and week 2 problem distribution

    10/7~10/12: (Participants) Week 2 Problem Solving

    10/13: (Gemma) Week 2 feedback and week 3 problem distribution

    10/14~10/19: (Participants) Week 3 Problem Solving

    10/20: (Gemma) Week 3 feedback and week 4 issue distribution

    10/21~10/26: (Participants) Week 4 Problem Solving

    10/27: (Gemma) week4 feedback

    0
  • gemmadata님의 프로필 이미지

    Edited

    The September problem-solving class has ended .

    We are planning to recruit again at the end of September , so if you are interested, please apply in advance through the Google form! We will contact you separately via the email address you provided.


    hello everyone :)

    [9th] We are looking to recruit for the SQL coding test problem solving class .

    It will be free every month through 2024 .

     

    Since it is a first-come , first-served basis, we will proceed based on the person who sends the survey link first. (Anyone other than the first 1 person will be transferred to the waiting list for the next month.)

    https://forms.gle/14iJDdvjsxUg3JMXA

    Please refer to the following for the progress.

    If you have any questions, please feel free to ask in the comments.


    [Persons] 1 person on a first-come, first-served basis

    (Anyone other than the first 1 person will be transferred to the waiting list for the next month)

    [Deadline] 2024/9/2 (Mon) ~ 9/28 (Sat) (4 times)

    [How to proceed]

    - I will share three problems in an open KakaoTalk room on Sunday.

    - Participants will work on the problem for one hour on any day from Monday to Saturday without interruption.

    - I'll share the code feedback and the next 3 issues on Sunday when I return.

    [schedule]

    9/1: (Gemma) Week 1 problem distribution

    9/2~9/7: (Participants) Week 1 Problem Solving

    9/8: (Gemma) Week 1 feedback and week 2 problem distribution

    9/9~9/14: (Participants) Week 2 Problem Solving

    9/15: (Gemma) Week 2 feedback and week 3 problem distribution

    9/16~9/21: (Participants) Week 3 Problem Solving

    9/22: (Gemma) Week 3 feedback and week 4 problem distribution

    9/23~9/28: (Participants) Week 4 Problem Solving

    9/29: (Gemma) week4 feedback

    0
  • gemmadata님의 프로필 이미지

    Edited

    The August problem-solving class has ended .

    We are planning to recruit again at the end of August , so if you are interested, please apply in advance through the Google form! We will contact you separately via the email address you provided.



    hello everyone :)

    [8th] We are looking to recruit for the SQL coding test problem solving class .

    It will be free every month through 2024 .

     

    Since it is a first-come , first-served basis, we will proceed based on the person who sends the survey link first. (Anyone other than the first 1 person will be transferred to the waiting list for the next month.)

    https://forms.gle/14iJDdvjsxUg3JMXA

    Please refer to the following for the progress.

    If you have any questions, please feel free to ask in the comments.



    [Persons] 1 person on a first-come, first-served basis

    (Anyone other than the first 1 person will be transferred to the waiting list for the next month)

     

    [Deadline] 2024/8/5 (Mon) ~ 8/31 (Sat) (4 times)

     

    [How to proceed]

    - I will share three problems in an open KakaoTalk room on Sunday.

    - Participants will work on the problem for one hour on any day from Monday to Saturday without interruption.

    - I'll share the code feedback and the next 3 issues on Sunday when I return.

     

    [schedule]

    8/4: (Gemma) Week 1 problem distribution

    8/5~8/10: (Participants) Week 1 Problem Solving

    8/11: (Gemma) Week 1 feedback and week 2 problem distribution

    8/12~8/17: (Participants) Week 2 Problem Solving

    8/18: (Gemma) Week 2 feedback and week 3 problem distribution

    8/19~8/24: (Participants) Week 3 Problem Solving

    8/25: (Gemma) Week 3 feedback and week 4 problem distribution

    8/26~8/31: (Participants) Week 4 Problem Solving

    9/1: (Gemma) week4 feedback

    imageimage

    0
  • gemmadata님의 프로필 이미지

    Edited

    The July problem-solving class has ended .

    We are planning to recruit again at the end of July, so if you are interested, please apply in advance through the Google form! We will contact you separately via the email address you provided.


    hello everyone :)

    [7th] We are looking to recruit for the SQL coding test problem solving class .

    It will be free every month through 2024 .

     

    Since it is a first-come , first-served basis, we will proceed based on the person who sends the survey link first. (Anyone other than the first 1 person will be transferred to the waiting list for the next month.)

    https://forms.gle/14iJDdvjsxUg3JMXA

    Please refer to the following for the progress.

    If you have any questions, please feel free to ask in the comments.



    [Persons] 1 person on a first-come, first-served basis

    (Anyone other than the first 1 person will be transferred to the waiting list for the next month)

     

    [Deadline] 2024/7/1 (Mon) ~ 7/27 (Sat) (4 times)

     

    [How to proceed]

    - I will share three problems in an open KakaoTalk room on Sunday.

    - Participants will work on the problem for one hour on any day from Monday to Saturday without interruption.

    - I'll share the code feedback and the next 3 issues on Sunday when I return.

     

    [schedule]

    6/30: (Gemma) Week 1 problem distribution

    7/1~7/6: (Participants) Week 1 Problem Solving

    7/7: (Gemma) Week 1 feedback and week 2 problem distribution

    7/8~7/13: (Participants) Week 2 Problem Solving

    7/14: (Gemma) Week 2 feedback and week 3 problem distribution

    7/15~7/20: (Participants) Week 3 Problem Solving

    7/21: (Gemma) Week 3 feedback and week 4 problem distribution

    7/22~7/27: (Participants) Week 4 Problem Solving

    7/28: (Gemma) week4 feedback

    0

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