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number 타입에 15.63 입력==> 15.63
number(15) 타입에 15.63 입력 ==> 16 <== 반올림 됨!
number(15,2)타입에 15.63 입력 ==> 15.63
number(15,2)타입에 15.6371 입력 ==> 15.64 반올림
number(15,2)타입에 12345678901234.64 ===> 오라클에러 ORA-01438
따라서 실수(소수점 포함)를 입력하려면
NUMBER타입이나 NUMBER(??,??) 로 정의해야 한다.
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