์ฝ”๋”ฉ ํ…Œ์ŠคํŠธ๋ฅผ ์œ„ํ•œ MySQL ์ •๋ฆฌ #1 ํ•ต์‹ฌ ํ‚ค์›Œ๋“œ

#1์—์„œ๋Š” ํ•ต์‹ฌ์ ์ธ ํ‚ค์›Œ๋“œ๋ฅผ ์ •๋ฆฌํ•˜๊ณ  #2์—์„œ๋Š” ํ”„๋กœ๊ทธ๋ž˜๋จธ์Šค SQL ๊ณ ๋“์  kit Level 3~4 ๋ฌธ์ œ ๋ช‡๊ฐœ๋ฅผ ๋‹ค๋ฃจ๋ฉด์„œ ์ž์ฃผ ์‚ฌ์šฉํ•˜๋Š” ํ•จ์ˆ˜๋“ค์„ ์ •๋ฆฌํ•ด๋ณด๋ ค๊ณ  ํ•œ๋‹ค. ๊ฐ„๋‹จํ•˜๊ฒŒ ํ‚ค์›Œ๋“œ๋“ค์„ ์ •๋ฆฌํ•˜๊ณ  ๋งˆ์ง€๋ง‰์— ์ด๋“ค์„ ์ ํ•ฉํ•˜๊ฒŒ ์‚ฌ์šฉํ•˜๋Š” ๋ฒ•์„ ์ •๋ฆฌํ•  ๊ฒƒ์ด๋‹ค. ORDER BY SELECT * FROM ํ…Œ์ด๋ธ”๋ช… ORDER BY ์ปฌ๋Ÿผ๋ช… (ASC) ํŠน์ • ์ปฌ๋Ÿผ์„ ๊ธฐ์ค€์œผ๋กœ ์ •๋ ฌ. ๊ธฐ๋ณธ๊ฐ’์€ ์˜ค๋ฆ„์ฐจ์ˆœ(ASC) ์ •๋ ฌ SELECT * FROM ํ…Œ์ด๋ธ”๋ช… ORDER BY ์นผ๋Ÿผ1, ์นผ๋Ÿผ2 DESC ์œ„ ๋ฐฉ์‹์ฒ˜๋Ÿผ ์—ฌ๋Ÿฌ ์นผ๋Ÿผ์— ์ ์šฉํ•  ์ˆ˜๋„ ์žˆ๋‹ค. GROUP BY, HAVING SELECT id, COUNT(*) FROM member GROUP BY id HAVING id > 3 ํŠน์ • ์นผ๋Ÿผ์„ ๊ธฐ์ค€์œผ๋กœ ๊ทธ๋ฃนํ™”ํ•œ๋‹ค. ์ฃผ๋กœ ์ง‘๊ณ„ํ•จ์ˆ˜(COUNT(), ..

PS 2021. 3. 18. 08:22
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