์—ฐ์Šต๋ฌธ์ œ 24

[ํ”„๋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. ์ฃผ์‹๊ฐ€๊ฒฉ

โญ ๋ฌธ์ œ ๋งํฌ https://school.programmers.co.kr/learn/courses/30/lessons/42584 ํ”„๋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 from collections import deque def solution(prices): answer = [] prices = deque(prices) while prices: time = 0 price = prices.popleft() for p in prices: time += 1 if p < price: break answer.append(time) retur..

Python/Programmers 2023.05.01

[ํ”„๋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/Python] Lv1. ์„ฑ๊ฒฉ ์œ ํ˜• ๊ฒ€์‚ฌํ•˜๊ธฐ

โญ ๋ฌธ์ œ ๋งํฌ https://school.programmers.co.kr/learn/courses/30/lessons/118666 ํ”„๋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(survey, choices): answer = '' score = {1:-3, 2:-2, 3:-1, 4:0, 5:1, 6:2, 7:3} types = {"R":0, "T":0, "F":0, "C":0, "M":0, "J":0, "A":0, "N":0} # ํƒ€์ž…๋ณ„ ์ ์ˆ˜ sets = [("R","T"), ("C","F"), ("J","M"),("..

Python/Programmers 2023.04.21

[ํ”„๋กœ๊ทธ๋ž˜๋จธ์Šค/Python] Lv 2. 2๊ฐœ ์ดํ•˜๋กœ ๋‹ค๋ฅธ ๋น„ํŠธ

โญ ๋ฌธ์ œ ๋งํฌ https://school.programmers.co.kr/learn/courses/30/lessons/77885 ํ”„๋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(numbers): answer = [] for n in numbers: # ์ง์ˆ˜์ผ ๊ฒฝ์šฐ if n%2 == 0: # ๋ฐ”๋กœ ๋‹ค์Œ์— ์˜ค๋Š” ์ˆ˜๊ฐ€ ๋‹ต answer.append(n+1) # ํ™€์ˆ˜์ผ ๊ฒฝ์šฐ else: temp = '0' + bin(n)[2:] idx = temp.rfind('0') # ์˜ค๋ฅธ์ชฝ๋ถ€ํ„ฐ ๋ฌธ์ž์ฐพ๊ธฐ temp = list(temp) # ๊ฐ€์žฅ..

Python/Programmers 2023.04.21

[ํ”„๋กœ๊ทธ๋ž˜๋จธ์Šค/Python] Lv 1. ๊ณต์›์‚ฐ์ฑ…

โญ ๋ฌธ์ œ ๋งํฌ https://school.programmers.co.kr/learn/courses/30/lessons/172928 ํ”„๋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(park, routes): x, y = 0, 0 # ์‹œ์ž‘์  w, h = len(park[0]), len(park) # ๊ฐ€๋กœ, ์„ธ๋กœ op = {"N":(-1,0), "S":(1,0), "W":(0,-1), "E":(0,1)} # ์‹œ์ž‘์  for i in range(h): for j in range(w): if park[i][j]=="S": x, y..

Python/Programmers 2023.04.21

[ํ”„๋กœ๊ทธ๋ž˜๋จธ์Šค/SQL] Lv 1. ๊ฐ•์›๋„์— ์œ„์น˜ํ•œ ์ƒ์‚ฐ๊ณต์žฅ ๋ชฉ๋ก ์ถœ๋ ฅํ•˜๊ธฐ (MySQL)

โญ ๋ฌธ์ œ ๋งํฌ https://school.programmers.co.kr/learn/courses/30/lessons/131112 ํ”„๋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 FACTORY_ID, FACTORY_NAME, ADDRESS FROM FOOD_FACTORY WHERE ADDRESS LIKE "๊ฐ•์›๋„%" ORDER BY FACTORY_ID

SQL/Programmers 2023.04.18

[ํ”„๋กœ๊ทธ๋ž˜๋จธ์Šค/SQL] Lv 1. ์กฐ๊ฑด์— ๋งž๋Š” ๋„์„œ ๋ฆฌ์ŠคํŠธ ์ถœ๋ ฅํ•˜๊ธฐ (MySQL)

โญ ๋ฌธ์ œ ๋งํฌ https://school.programmers.co.kr/learn/courses/30/lessons/144853 ํ”„๋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 BOOK_ID, DATE_FORMAT(PUBLISHED_DATE, "%Y-%m-%d") AS PUBLISHED_DATE FROM BOOK WHERE (YEAR(PUBLISHED_DATE)=2021) AND (CATEGORY="์ธ๋ฌธ") ORDER BY PUBLISHED_DATE ASC

SQL/Programmers 2023.04.18