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SQLD ๋Œ€๋น„ (7) - SQL ๋ฌธ๋ฒ• ๋ฐ ๋ผ์ด๋ธŒ๋Ÿฌ๋ฆฌ_2

SQLD ๋Œ€๋น„ (6) - SQL ๋ฌธ๋ฒ• ๋ฐ ๋ผ์ด๋ธŒ๋Ÿฌ๋ฆฌ_1 SQLD ๋Œ€๋น„ (5) - ๊ด€๊ณ„ํ˜• ๋ฐ์ดํ„ฐ๋ฒ ์ด์Šค (RDBMS) ๊ณผ๋ชฉ II ์‹œ์ž‘ ! ๋…ธ๋žญ์ด ์ฑ…์œผ๋กœ ๊ณผ๋ชฉ I์„ ๋ชจ๋‘ ํ’€๊ณ  ์˜ค๋‹ต์ •๋ฆฌ๊นŒ์ง€ ๋งˆ๋ฌด๋ฆฌํ–ˆ๋‹ค. SQLD ๋Œ€๋น„ (4) - ์„ฑ๋Šฅ ๋ฐ์ดํ„ฐ ๋ชจ๋ธ๋ง ๋ฐ ์ •๊ทœํ™”/๋ฐ˜์ •๊ทœํ™”, ๋ฐ์ดํ„ฐ๋ฒ ์ด์Šค 2023.11. sjkoding.tistory.com ์ด์ „ ๊ธ€๊ณผ ์ด์–ด์ง€๋Š” ๊ธ€์ž…๋‹ˆ๋‹ค. ํ•ด๋‹น ์ •๋ฆฌ๊ธ€์€ ์•„๋ž˜์˜ ์œ ํŠœ๋ธŒ ์˜์ƒ์„ ์ฐธ๊ณ ํ•˜์—ฌ ๋งŒ๋“ค์—ˆ์Šต๋‹ˆ๋‹ค. ๋ฌธ์ œ ์‹œ ์‚ญ์ œํ•˜๊ฒ ์Šต๋‹ˆ๋‹ค. ๋นจ๊ฐ„์ƒ‰ ํ˜•๊ด‘ํŽœ์€ ๊ฐ•์˜์—์„œ ๊ฐ•์กฐํ•œ ๋ถ€๋ถ„, ๋…ธ๋ž€์ƒ‰ ํ˜•๊ด‘ํŽœ์€ ์ถ”๊ฐ€ ์„œ์น˜๋กœ ๋‚ด์šฉ์„ '์ง์ ‘' ๋ณด๊ฐ•ํ•œ ๋ถ€๋ถ„์ž…๋‹ˆ๋‹ค. Group by Group by๋Š” ์ง‘ํ•ฉ(ํ…Œ์ด๋ธ”) ๋‚ด์—์„œ ํ•˜๋‚˜ ํ˜น์€ ์—ฌ๋Ÿฌ ํ–‰์„ ๊ทธ๋ฃนํ™” ํ•˜์—ฌ ์ง‘๊ณ„ํ•จ์ˆ˜(SUM, MIN, AVG๋“ฑ)๋ฅผ ์ด์šฉํ•˜๋Š” ๊ฒƒ Having ์ ˆ์„ ์ด์šฉํ•˜์—ฌ..

SQL/SQLD 2023. 11. 13. 23:06