()--转换函数 --数字转换字符串 )||'分' from dual; ||'' from dual; ()--日期转字符串 select to_char(sysdate,'yyyy-mm-dd') from dual; select to_char(sysdate,'yyyy')||'年'||to_char(sysdate,'mm')||'月'||to_char(sysdate,'dd')||'日' from dual; select to_char(sysdate,'yyyy-mm-dd…