ํ”„๋กœ๊ทธ๋ž˜๋จธ์Šค 38

[ํ”„๋กœ๊ทธ๋ž˜๋จธ์Šค/SQL] Lv 4. ์ €์ž ๋ณ„ ์นดํ…Œ๊ณ ๋ฆฌ ๋ณ„ ๋งค์ถœ์•ก ์ง‘๊ณ„ํ•˜๊ธฐ (MySQL)

โญ ๋ฌธ์ œ ๋งํฌ https://school.programmers.co.kr/learn/courses/30/lessons/144856 ํ”„๋กœ๊ทธ๋ž˜๋จธ์Šค ์ฝ”๋“œ ์ค‘์‹ฌ์˜ ๊ฐœ๋ฐœ์ž ์ฑ„์šฉ. ์Šคํƒ ๊ธฐ๋ฐ˜์˜ ํฌ์ง€์…˜ ๋งค์นญ. ํ”„๋กœ๊ทธ๋ž˜๋จธ์Šค์˜ ๊ฐœ๋ฐœ์ž ๋งž์ถคํ˜• ํ”„๋กœํ•„์„ ๋“ฑ๋กํ•˜๊ณ , ๋‚˜์™€ ๊ธฐ์ˆ  ๊ถํ•ฉ์ด ์ž˜ ๋งž๋Š” ๊ธฐ์—…๋“ค์„ ๋งค์นญ ๋ฐ›์œผ์„ธ์š”. programmers.co.kr โญ ํ’€์ด ์ฝ”๋“œ SELECT B.AUTHOR_ID, AUTHOR_NAME, CATEGORY, (SUM(SALES*PRICE)) AS TOTAL_SALES FROM BOOK B JOIN AUTHOR A ON B.AUTHOR_ID = A.AUTHOR_ID JOIN BOOK_SALES S ON B.BOOK_ID = S.BOOK_ID WHERE DATE_FORMAT(SALES_DATE, "..

SQL/Programmers 2023.05.09

[ํ”„๋กœ๊ทธ๋ž˜๋จธ์Šค/SQL] Lv 3. ๋Œ€์—ฌ ํšŸ์ˆ˜๊ฐ€ ๋งŽ์€ ์ž๋™์ฐจ๋“ค์˜ ์›”๋ณ„ ๋Œ€์—ฌ ํšŸ์ˆ˜ ๊ตฌํ•˜๊ธฐ

โญ ๋ฌธ์ œ ๋งํฌ https://school.programmers.co.kr/learn/courses/30/lessons/151139 ํ”„๋กœ๊ทธ๋ž˜๋จธ์Šค ์ฝ”๋“œ ์ค‘์‹ฌ์˜ ๊ฐœ๋ฐœ์ž ์ฑ„์šฉ. ์Šคํƒ ๊ธฐ๋ฐ˜์˜ ํฌ์ง€์…˜ ๋งค์นญ. ํ”„๋กœ๊ทธ๋ž˜๋จธ์Šค์˜ ๊ฐœ๋ฐœ์ž ๋งž์ถคํ˜• ํ”„๋กœํ•„์„ ๋“ฑ๋กํ•˜๊ณ , ๋‚˜์™€ ๊ธฐ์ˆ  ๊ถํ•ฉ์ด ์ž˜ ๋งž๋Š” ๊ธฐ์—…๋“ค์„ ๋งค์นญ ๋ฐ›์œผ์„ธ์š”. programmers.co.kr โญ ํ’€์ด ์ฝ”๋“œ SELECT MONTH(START_DATE) AS MONTH, CAR_ID, COUNT(CAR_ID) AS RECORDS FROM CAR_RENTAL_COMPANY_RENTAL_HISTORY WHERE CAR_ID IN (SELECT CAR_ID FROM CAR_RENTAL_COMPANY_RENTAL_HISTORY WHERE START_DATE BETWEEN '202..

SQL/Programmers 2023.05.08

[ํ”„๋กœ๊ทธ๋ž˜๋จธ์Šค/SQL] Lv 4. ์‹ํ’ˆ๋ถ„๋ฅ˜๋ณ„ ๊ฐ€์žฅ ๋น„์‹ผ ์‹ํ’ˆ์˜ ์ •๋ณด ์กฐํšŒํ•˜๊ธฐ (MySQL)

โญ ๋ฌธ์ œ ๋งํฌ https://school.programmers.co.kr/learn/courses/30/lessons/131116 ํ”„๋กœ๊ทธ๋ž˜๋จธ์Šค ์ฝ”๋“œ ์ค‘์‹ฌ์˜ ๊ฐœ๋ฐœ์ž ์ฑ„์šฉ. ์Šคํƒ ๊ธฐ๋ฐ˜์˜ ํฌ์ง€์…˜ ๋งค์นญ. ํ”„๋กœ๊ทธ๋ž˜๋จธ์Šค์˜ ๊ฐœ๋ฐœ์ž ๋งž์ถคํ˜• ํ”„๋กœํ•„์„ ๋“ฑ๋กํ•˜๊ณ , ๋‚˜์™€ ๊ธฐ์ˆ  ๊ถํ•ฉ์ด ์ž˜ ๋งž๋Š” ๊ธฐ์—…๋“ค์„ ๋งค์นญ ๋ฐ›์œผ์„ธ์š”. programmers.co.kr โญ ํ’€์ด ์ฝ”๋“œ SELECT CATEGORY, PRICE AS MAX_PRICE, PRODUCT_NAME FROM FOOD_PRODUCT WHERE CATEGORY IN ('๊ณผ์ž', '๊ตญ', '๊น€์น˜', '์‹์šฉ์œ ') AND PRICE IN (SELECT MAX(PRICE) FROM FOOD_PRODUCT GROUP BY CATEGORY) ORDER BY MAX_PRICE DESC ์ตœ๋Œ€..

SQL/Programmers 2023.05.08

[ํ”„๋กœ๊ทธ๋ž˜๋จธ์Šค/Python] Lv 2. ๋กค์ผ€์ดํฌ ์ž๋ฅด๊ธฐ

โญ ๋ฌธ์ œ ๋งํฌ https://school.programmers.co.kr/learn/courses/30/lessons/132265 ํ”„๋กœ๊ทธ๋ž˜๋จธ์Šค ์ฝ”๋“œ ์ค‘์‹ฌ์˜ ๊ฐœ๋ฐœ์ž ์ฑ„์šฉ. ์Šคํƒ ๊ธฐ๋ฐ˜์˜ ํฌ์ง€์…˜ ๋งค์นญ. ํ”„๋กœ๊ทธ๋ž˜๋จธ์Šค์˜ ๊ฐœ๋ฐœ์ž ๋งž์ถคํ˜• ํ”„๋กœํ•„์„ ๋“ฑ๋กํ•˜๊ณ , ๋‚˜์™€ ๊ธฐ์ˆ  ๊ถํ•ฉ์ด ์ž˜ ๋งž๋Š” ๊ธฐ์—…๋“ค์„ ๋งค์นญ ๋ฐ›์œผ์„ธ์š”. programmers.co.kr โญ ํ’€์ด ์ฝ”๋“œ โŒ ์‹œ๊ฐ„์ดˆ๊ณผ def solution(topping): answer = 0 for i in range(len(topping)): a = set(topping[:i]) b = set(topping[i:]) if len(a) == len(b): answer += 1 return answer ๋ฆฌ์ŠคํŠธ ์Šฌ๋ผ์ด์‹ฑ์„ ์‚ฌ์šฉํ–ˆ๋”๋‹ˆ ์‹œ๊ฐ„์ดˆ๊ณผ๊ฐ€ ๋ฐœ์ƒํ–ˆ๋‹ค!.. โญ• ํ†ต๊ณผ from collec..

Python/Programmers 2023.05.01

[ํ”„๋กœ๊ทธ๋ž˜๋จธ์Šค/SQL] Lv 3. ์ž๋™์ฐจ ๋Œ€์—ฌ ๊ธฐ๋ก์—์„œ ๋Œ€์—ฌ์ค‘ / ๋Œ€์—ฌ ๊ฐ€๋Šฅ ์—ฌ๋ถ€ ๊ตฌ๋ถ„ํ•˜๊ธฐ (MySQL)

โญ ๋ฌธ์ œ ๋งํฌ https://school.programmers.co.kr/learn/courses/30/lessons/157340 ํ”„๋กœ๊ทธ๋ž˜๋จธ์Šค ์ฝ”๋“œ ์ค‘์‹ฌ์˜ ๊ฐœ๋ฐœ์ž ์ฑ„์šฉ. ์Šคํƒ ๊ธฐ๋ฐ˜์˜ ํฌ์ง€์…˜ ๋งค์นญ. ํ”„๋กœ๊ทธ๋ž˜๋จธ์Šค์˜ ๊ฐœ๋ฐœ์ž ๋งž์ถคํ˜• ํ”„๋กœํ•„์„ ๋“ฑ๋กํ•˜๊ณ , ๋‚˜์™€ ๊ธฐ์ˆ  ๊ถํ•ฉ์ด ์ž˜ ๋งž๋Š” ๊ธฐ์—…๋“ค์„ ๋งค์นญ ๋ฐ›์œผ์„ธ์š”. programmers.co.kr โญ ํ’€์ด ์ฝ”๋“œ SELECT CAR_ID, CASE WHEN CAR_ID IN ( SELECT CAR_ID FROM CAR_RENTAL_COMPANY_RENTAL_HISTORY WHERE "2022-10-16" BETWEEN START_DATE AND END_DATE ) THEN "๋Œ€์—ฌ์ค‘" ELSE "๋Œ€์—ฌ ๊ฐ€๋Šฅ" END AS AVAILABILITY FROM CAR_RENTAL_COM..

SQL/Programmers 2023.04.29

[ํ”„๋กœ๊ทธ๋ž˜๋จธ์Šค/SQL] Lv 2. ์ค‘๋ณต ์ œ๊ฑฐํ•˜๊ธฐ (MySQL)

โญ ๋ฌธ์ œ ๋งํฌ https://school.programmers.co.kr/learn/courses/30/lessons/59408 ํ”„๋กœ๊ทธ๋ž˜๋จธ์Šค ์ฝ”๋“œ ์ค‘์‹ฌ์˜ ๊ฐœ๋ฐœ์ž ์ฑ„์šฉ. ์Šคํƒ ๊ธฐ๋ฐ˜์˜ ํฌ์ง€์…˜ ๋งค์นญ. ํ”„๋กœ๊ทธ๋ž˜๋จธ์Šค์˜ ๊ฐœ๋ฐœ์ž ๋งž์ถคํ˜• ํ”„๋กœํ•„์„ ๋“ฑ๋กํ•˜๊ณ , ๋‚˜์™€ ๊ธฐ์ˆ  ๊ถํ•ฉ์ด ์ž˜ ๋งž๋Š” ๊ธฐ์—…๋“ค์„ ๋งค์นญ ๋ฐ›์œผ์„ธ์š”. programmers.co.kr โญ ํ’€์ด ์ฝ”๋“œ SELECT COUNT(DISTINCT(NAME)) AS count FROM ANIMAL_INS

SQL/Programmers 2023.04.23

[ํ”„๋กœ๊ทธ๋ž˜๋จธ์Šค/SQL] Lv 2. ๊ฐ€๊ฒฉ์ด ์ œ์ผ ๋น„์‹ผ ์‹ํ’ˆ์˜ ์ •๋ณด ์ถœ๋ ฅํ•˜๊ธฐ (MySQL)

โญ ๋ฌธ์ œ ๋งํฌ https://school.programmers.co.kr/learn/courses/30/lessons/131115 ํ”„๋กœ๊ทธ๋ž˜๋จธ์Šค ์ฝ”๋“œ ์ค‘์‹ฌ์˜ ๊ฐœ๋ฐœ์ž ์ฑ„์šฉ. ์Šคํƒ ๊ธฐ๋ฐ˜์˜ ํฌ์ง€์…˜ ๋งค์นญ. ํ”„๋กœ๊ทธ๋ž˜๋จธ์Šค์˜ ๊ฐœ๋ฐœ์ž ๋งž์ถคํ˜• ํ”„๋กœํ•„์„ ๋“ฑ๋กํ•˜๊ณ , ๋‚˜์™€ ๊ธฐ์ˆ  ๊ถํ•ฉ์ด ์ž˜ ๋งž๋Š” ๊ธฐ์—…๋“ค์„ ๋งค์นญ ๋ฐ›์œผ์„ธ์š”. programmers.co.kr โญ ํ’€์ด ์ฝ”๋“œ SELECT * FROM FOOD_PRODUCT WHERE PRICE = (SELECT MAX(PRICE) FROM FOOD_PRODUCT)

SQL/Programmers 2023.04.23

[ํ”„๋กœ๊ทธ๋ž˜๋จธ์Šค/Python] Lv 2. ์ˆซ์ž ๋ณ€ํ™˜ํ•˜๊ธฐ

โญ ๋ฌธ์ œ ๋งํฌ https://school.programmers.co.kr/learn/courses/30/lessons/154538 ํ”„๋กœ๊ทธ๋ž˜๋จธ์Šค ์ฝ”๋“œ ์ค‘์‹ฌ์˜ ๊ฐœ๋ฐœ์ž ์ฑ„์šฉ. ์Šคํƒ ๊ธฐ๋ฐ˜์˜ ํฌ์ง€์…˜ ๋งค์นญ. ํ”„๋กœ๊ทธ๋ž˜๋จธ์Šค์˜ ๊ฐœ๋ฐœ์ž ๋งž์ถคํ˜• ํ”„๋กœํ•„์„ ๋“ฑ๋กํ•˜๊ณ , ๋‚˜์™€ ๊ธฐ์ˆ  ๊ถํ•ฉ์ด ์ž˜ ๋งž๋Š” ๊ธฐ์—…๋“ค์„ ๋งค์นญ ๋ฐ›์œผ์„ธ์š”. programmers.co.kr โญ ํ’€์ด ์ฝ”๋“œ # dp ์•Œ๊ณ ๋ฆฌ์ฆ˜ # ํ˜„์žฌ๊นŒ์ง€ ๋„๋‹ฌํ•˜๋Š” ๋ฐ ์—ฐ์‚ฐ ์ˆ˜ + 1 ๊ณผ ๋„๋‹ฌํ•˜๋ ค๊ณ ํ•˜๋Š” ์ˆ˜์— ์ €์žฅ๋œ ๊ฐ’์„ ๋น„๊ตํ•˜์—ฌ, # ์ž‘์€ ๊ฐ’์„ ํ˜„์žฌ ์—ฐ์‚ฐ ์ˆ˜๋กœ ์ €์žฅ def solution(x, y, n): answer = 0 d = [1e9] * (y+1) # ํฐ ์ˆ˜๋กœ ์ดˆ๊ธฐํ™” d[x] = 0 for i in range(x, y+1): # n์„ ๋”ํ•˜๋Š” ๊ฒฝ์šฐ if i+n

Python/Programmers 2023.04.23

[ํ”„๋กœ๊ทธ๋ž˜๋จธ์Šค/Python] Lv 1. ๋ฐ”ํƒ•ํ™”๋ฉด ์ •๋ฆฌ

โญ ๋ฌธ์ œ ๋งํฌ https://school.programmers.co.kr/learn/courses/30/lessons/161990 ํ”„๋กœ๊ทธ๋ž˜๋จธ์Šค ์ฝ”๋“œ ์ค‘์‹ฌ์˜ ๊ฐœ๋ฐœ์ž ์ฑ„์šฉ. ์Šคํƒ ๊ธฐ๋ฐ˜์˜ ํฌ์ง€์…˜ ๋งค์นญ. ํ”„๋กœ๊ทธ๋ž˜๋จธ์Šค์˜ ๊ฐœ๋ฐœ์ž ๋งž์ถคํ˜• ํ”„๋กœํ•„์„ ๋“ฑ๋กํ•˜๊ณ , ๋‚˜์™€ ๊ธฐ์ˆ  ๊ถํ•ฉ์ด ์ž˜ ๋งž๋Š” ๊ธฐ์—…๋“ค์„ ๋งค์นญ ๋ฐ›์œผ์„ธ์š”. programmers.co.kr โญ ํ’€์ด ์ฝ”๋“œ def solution(wallpaper): x_loc = [] y_loc = [] for i in range(len(wallpaper)): for j in range(len(wallpaper[i])): if wallpaper[i][j]=="#": x_loc.append(i) y_loc.append(j) start = [min(x_loc), min(y_loc)] en..

Python/Programmers 2023.04.23

[ํ”„๋กœ๊ทธ๋ž˜๋จธ์Šค/Python] Lv 2. ํฐ ์ˆ˜ ๋งŒ๋“ค๊ธฐ

โญ ๋ฌธ์ œ ๋งํฌ https://school.programmers.co.kr/learn/courses/30/lessons/42883 ํ”„๋กœ๊ทธ๋ž˜๋จธ์Šค ์ฝ”๋“œ ์ค‘์‹ฌ์˜ ๊ฐœ๋ฐœ์ž ์ฑ„์šฉ. ์Šคํƒ ๊ธฐ๋ฐ˜์˜ ํฌ์ง€์…˜ ๋งค์นญ. ํ”„๋กœ๊ทธ๋ž˜๋จธ์Šค์˜ ๊ฐœ๋ฐœ์ž ๋งž์ถคํ˜• ํ”„๋กœํ•„์„ ๋“ฑ๋กํ•˜๊ณ , ๋‚˜์™€ ๊ธฐ์ˆ  ๊ถํ•ฉ์ด ์ž˜ ๋งž๋Š” ๊ธฐ์—…๋“ค์„ ๋งค์นญ ๋ฐ›์œผ์„ธ์š”. programmers.co.kr โญ ํ’€์ด ์ฝ”๋“œ # ํƒ์š•๋ฒ• def solution(number, k): answer = '' stack = [] for n in number: while stack and (stack[-1] 0): stack.pop() k -= 1 stack.append(n) # [4] - [4,1] - [4] - [] - [7] - [7,7] - [7,7,2] # - [7,..

Python/Programmers 2023.04.23