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alter session set nls_date_format = 'yyyy-mm-dd hh24:mi:ss';

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select to_date(datetime,'YYYY-MM-DD HH24:MI:SS','NLS_DATE_LANGUAGE = American') from tb

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1 select to_char(to_date('2010-5-7 12:00:00','yyyy-mm-dd hh24:mi:ss')+interval '12' hour,
2* 'yyyy-mm-dd hh24:mi:ss') from dual
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TO_CHAR(TO_DATE('20
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alter session set nls_date_format='yyyy-mm-dd hh24:mi:ss'


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  alter session set nls_date_format='yyyy-mm-dd hh24:mi:ss'

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