[SQL] SIGN
SIGN 숫자 자료형의 매겨변수가 음수라면, -1, 0이라면 0, 양수라면 1을 리턴하는 함수
SIGN 숫자 자료형의 매겨변수가 음수라면, -1, 0이라면 0, 양수라면 1을 리턴하는 함수
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