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select sname,(2009-10-05)-birth
from student;

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select sname, to_char(sysdate,'YYYY')- to_char(birth,'YYYY') age from student"; 


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select sname,trunc(date'2009-10-05'-to_date(birth,'yyyymm') ) age
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update student set birth=to_date('2000-05-05','yyyy-mm-dd') where sname='ÕÅÁ¢'

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