๋ชฉ๋ก์ง‘ํ•ฉ์—ฐ์‚ฐ์ž (1)

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SQLD ๋Œ€๋น„ (10) - ์„œ๋ธŒ์ฟผ๋ฆฌ(Sub Query), ๋น„๋“ฑ๊ฐ€ ์กฐ์ธ, ์ง‘ํ•ฉ์—ฐ์‚ฐ์ž

SQLD ๋Œ€๋น„ (9) - JOIN SELECT * FROM Employees CROSS JOIN Departments; SELECT * FROM Employees, Departments;โ€‹ SQLD ๋Œ€๋น„ (8) - SQL ๋ฌธ๋ฒ• ๋ฐ ๋ผ์ด๋ธŒ๋Ÿฌ๋ฆฌ_3 SQLD ๋Œ€๋น„ (7) - SQL ๋ฌธ๋ฒ• ๋ฐ ๋ผ์ด๋ธŒ๋Ÿฌ๋ฆฌ_2 SQLD ๋Œ€๋น„ (6) - SQL ๋ฌธ๋ฒ• ๋ฐ ๋ผ์ด๋ธŒ๋Ÿฌ๋ฆฌ_1 SQLD ๋Œ€๋น„ (5 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. ์„œ๋ธŒ์ฟผ๋ฆฌ(Sub Query) ํ•˜๋‚˜์˜ SQL์— ํฌํ•จ๋˜์–ด ์žˆ๋Š” ๋˜ ๋‹ค๋ฅธ SQL์„ ์ง€์นญ..

SQL/SQLD 2023. 11. 16. 23:18