摘要： select to_char(sysdate, 'yyyy') from dual;select to_char(sysdate, 'mm') from dual;select to_char(sysdate, 'dd') from dual; 阅读全文

摘要： select round(34.44,0) from dual结果：34select round(34.76,0) from dual结果：35select mod(103,10) from dual结果：3 阅读全文