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SQL code:
select to_char(sysdate,'yyyy-mm-dd') from dual;


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select to_char(to_date('15-MAR-09','dd-mon-yy','nls_date_language=american'),'dd-mm-yyyy') from dual

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name:NLS_DATE_FORMAT
values:yyyy-mm-dd


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alter session set nls_date_format='YYYY"-"MM"-"DD';


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alter session set nls_date_format='yyyy-mm-dd'
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create or replace trigger data_logon_trigger
after logon
ON DATABASE
begin
    execute immediate
        'alter session set nls_date_fo


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