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DBMS_OUTPUT.PUT_LINE(to_char(to_date('2010/05/19','yyyy/MM/dd'),'yyyy/mm/dd'));

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select * from nls_session_parameters where parameter='NLS_DATE_FORMAT';
PARAMETER VALUE
------------------------------------------------------------ --------------------------------------------------------------------------------
NLS_DATE_FORMAT YYYY/MM/DD

execute dbms_output.put_line(sysdate);
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alter session set NLS_DATE_FORMAT='YYYY/MM/DD';
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execute dbms_output.put_line(sysdate);
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alter session set NLS_DATE_FORMAT='YYYY-MM-DD HH24:MI:SS'

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