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[Day23] ์ ๋ต ๋ฐ์ดํฐ์ ๋์ผํจ์๋ ์ค๋ต ์ฒ๋ฆฌ๋ฉ๋๋ค.
์ฐธ๊ณ ๋ก, DATE_FORMAT(acquisition_date, '%Y') ๋ถ๋ถ์ SUBSTR(acquisition_date, 1, 4) ๋ก ๋ณ๊ฒฝํ์ฌ๋ ๋์ผ ์ค๋ต ๋ฉ์ธ์ง๊ฐ ์ถ๋ ฅ๋ฉ๋๋ค.