每天总结
1.RR日期格式：日期中RR与YY的区别，RR格式对日期作类似于舍入的操作，YY格式对日期作类似于截取的操作 RR YY 1995 27-oct-95 1995 1995 1995 27-oct-17 2017 1917 2001 27-oct-17 2017 2017 2001 27-oct-95 1995 2095 用法：select to_char(sysdate, 'YY') from dual; select to_char(to_date('95-11-27', 'RR-MM-DD'), 'YYYY-MM-DD') from dual; select to_char(to_date('95-11-27', 'YY-MM-DD'), 'YYYY-MM-DD') from dual; ?
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