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[์ •๋ณด์ฒ˜๋ฆฌ๊ธฐ์‚ฌ] ์‹ค๊ธฐ ํ”„๋กœ๊ทธ๋ž˜๋ฐ์–ธ์–ด 3๋ฌธ์ œ (22)

by Sun A 2024. 10. 4.

1๏ธโƒฃ [SQL]

2022.2ํšŒ

HํšŒ์‚ฌ์˜ ์ „์ฒด ์ œํ’ˆ ๋‹จ๊ฐ€์˜ ํ•ฉ ๋ณด๋‹ค ๋‹จ๊ฐ€๊ฐ€ ํฐ ์ œํ’ˆ ์ถœ๋ ฅ์„ ํ•˜๊ณ ์ž ํ•œ๋‹ค. ๊ด„ํ˜ธ์•ˆ์— ๋“ค์–ด๊ฐˆ ์•Œ๋งž๋Š” ์šฉ์–ด๋ฅผ ์ž‘์„ฑํ•˜์‹œ์˜ค.

[์ œํ’ˆํ…Œ์ด๋ธ”]

์ œ์กฐ์‚ฌ ์ œํ’ˆ๋ช… ๋‹จ๊ฐ€
A ๊ณผ์ž 1,000
B ์ดˆ์ฝœ๋ฆฟ 6,000
H ์‚ฌํƒ• 2,000
C ์•„์ด์Šคํฌ๋ฆผ 5,000
H ์‚ฌํƒ• 3,000

  
SELECT ์ œ์กฐ์‚ฌ, ์ œํ’ˆ๋ช…, ๋‹จ๊ฐ€
FROM ์ œํ’ˆ
WHERE ( ๊ด„ํ˜ธ )
๋‹จ๊ฐ€ > (SELECT SUM(๋‹จ๊ฐ€) FROM ์ œํ’ˆ WHERE ์ œ์กฐ์‚ฌ = 'H')

 

2๏ธโƒฃ [Python]

2021.1ํšŒ

๋‹ค์Œ์€ ํŒŒ์ด์ฌ ์ฝ”๋“œ์ด๋‹ค. ์ถœ๋ ฅ ๊ฒฐ๊ณผ๋ฅผ ์“ฐ์‹œ์˜ค.


  
class good :
li = ["seoul", "kyeonggi","inchon","daejeon","daegu","pusan"]
g = good()
str01 = ''
for i in g.li:
str01 = str01 + i[0]
print(str01)

 

skiddp

i ๋Š” good ํด๋ž˜์Šค์˜ li ๋ฆฌ์ŠคํŠธ ๊ฐ’์ด ๋ชจ๋‘ ๋Œ๋•Œ๊นŒ์ง€ ๋ฐ˜๋ณตํ•œ๋‹ค. 

str01 = str01 + i [0]

๊ฐ ๋ฆฌ์ŠคํŠธ ๊ฐ’์˜ [0] ์ธ๋ฑ์Šค ๊ฐ’๋งŒ ๊ฐ€์ง€๊ณ  ์™€์„œ ํ•ฉ์น˜๋ฉด ๋œ๋‹ค

skiddp

 

3๏ธโƒฃ [SQL]

2024.2ํšŒ

๋‹ค์Œ ํ…Œ์ด๋ธ”์—์„œ ์นด๋””๋„๋ฆฌํ‹ฐ(Cardinality)์™€ ๋””๊ทธ๋ฆฌ(Degree)๋ฅผ ๊ตฌํ•˜์‹œ์˜ค.

Cardinality : 5
Degree : 4