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select to_date('2005-01-01 13:14:20','yyyy-MM-dd HH24:mi:ss') from dual;
select date‘'2005-01-01’ from dual;
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select to_char(sysdate,'yyyy-MM-dd HH24:mm:ss') from dual
or
select to_char(sysdate,'yyyy-MM-dd) from dual
or
select to_char(sysdate,' HH24:mm:ss') from dual
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