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SQL Study Note

๐Ÿ’ก Codestates SQL study ์ž…๋‹ˆ๋‹ค.

  1. SQL ์€ ํ”„๋กœ๊ทธ๋ž˜๋จธ์Šค์˜ https://programmers.co.kr/learn/challenges ์ด ๋ฌธ์ œ๋“ค์„ ํ’€ ์ˆ˜ ์žˆ๋Š”๊ฒƒ์„ ๋ชฉํ‘œ๋กœ ์ง„ํ–‰ํ•ฉ๋‹ˆ๋‹ค.

    • SQL
- ์›” ~ ๊ธˆ โ‡’ ์ฃผ์ฐจ๋ณ„ ๊ณ„ํš์— ๋งž์ถ”์–ด ์ •ํ•ด์ง„ ๋ชฉ๋ก์„ ๊ณต๋ถ€
- ๊ธˆ์š”์ผ ์ €๋… โ‡’ ํ€ด์ฆˆ
- ํ†  ~ ์ผ ์ค‘ ํ•˜๋ฃจ  โ‡’  ์ง€์ •๋œ ์ธ์›์€ ๋ชจ์—ฌ์„œ ํ€ด์ฆˆ์— ๋Œ€ํ•ด ๋…ผ์˜ ๋ฐ ํ’€์ด๋ฒ• ๊ณต์œ 
  • ๊นƒํ—™ ๋ ˆํฌ ์ •๋ฆฌ reference

    https://github.com/JessyMin/SQL-recipe-book-practice/blob/master/11_finding_patterns_of_users.md

  • ์ถ”๊ฐ€์ ์œผ๋กœ '๋ฏธ๋‹ˆ' ํฌํŠธํด๋ฆฌ์˜ค๋ฅผ ์ œ์ž‘ํ•ฉ๋‹ˆ๋‹ค. ex )

    • ๋ฌธ์ œ์ œ๊ธฐ : ์นดํ…Œ๊ณ ๋ฆฌ๋ณ„๋กœ ๋งค์ถœ๊ณผ ์†Œ๊ณ„๋ฅผ ๊ณ„์‚ฐํ•˜๊ธฐ
    • ๋‚ด๊ฐ€ ํ’€๊ณ ์ž ํ•˜๋Š” ๋ฐฉํ–ฅ :
    • ์‹ค์ œ ์‚ฌ์šฉํ•œ ์ฟผ๋ฆฌ :
    • ๋ถ„์„ ๊ฒฐ๊ณผ :
    • ์ธ์‚ฌ์ดํŠธ :

์ปค๋ฆฌํ˜๋Ÿผย ๐Ÿ—’

- ์ฐธ์—ฌ ํŒ€์›:๐Ÿง‘

- ๊ฐ•๋‹ค์†”
- **๊น€๊ฐ€์—ฐ** 3์กฐ
- **๊น€์„ธ์ง„** 3์กฐ
- ๊น€์ฐฝ๋™
- ๊น€ํ˜œ์ง„
- **๋ฌธ์ง€์€** 3์กฐ
- ์„ค์œ ํ™˜
- ์—ผ๊ฒฝํ˜„
- ์˜ค๋‹ค์›
- ์œ ๋ณ‘์šฑ
- ์ด์€์ง€
- ์ดํ•ด์›…
- ์ •์†Œ์ง„
- **์ตœ์ค‘ํ›ˆ** 3์กฐ

--- ์„ค์œ ํ™˜ ๋‹˜ ์ œ๊ณต ---

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