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 select sysdate from dual; ´Óα±í²éϵͳʱ¼ä£¬ÒÔĬÈϸñʽÊä³ö¡£
sysdate+(5/24/60/60) ÔÚϵͳʱ¼ä»ù´¡ÉÏÑÓ³Ù5Ãë
sysdate+5/24/60 ÔÚϵͳʱ¼ä»ù´¡ÉÏÑÓ³Ù5·ÖÖÓ
sysdate+5/24 ÔÚϵͳʱ¼ä»ù´¡ÉÏÑÓ³Ù5Сʱ
sysdate+5 ÔÚϵͳʱ¼ä»ù´¡ÉÏÑÓ³Ù5Ìì
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´ÓÈÕÆÚת»¯Îªchar to_char(date, 'fmt' )
select to_char(sysdate, 'yyyy mm dd hh24:mi:ss') from dual;
select to_char(sysdate, 'fmyyyy mm dd hh24:mi:ss') from dual;
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select first_name,start_date from s_emp where to_char(start_date,'mm')='03';
to_date±í´ïÈÕÆÚ£º
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select to_date('2000 11 20', 'yyyy mm dd ') from dual;
select round(to_date('10-OCT-06' ,'dd-mon-RR') ) from dual;
to_number
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select to_number('10') from dual ;
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