[작성일: 2023. 03. 22] functionsingle row function한 줄 입력, 한 줄 출력numericabs(x)   절대값ceil(x)   올림floor(x)   내림round(x, y)   반올림-- abs : 절대값select abs(1.1) from dual;select abs(-50.1) from dual;-- ceil : 올림select ceil(2.83) from dual;select ceil(-2.83) from dual;-- floor : 내림select floor(3.14) from dual;select floor(-3.14) from dual;-- round : 반올림select round(2.83) from dual;select round(-2.83) from d..