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select * from teaminfo t where RKSJC=to_date('2009-12-21','yyyy-MM-dd');
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RKSJC >= to_date('2009-12-21','yyyy-MM-dd') and
RKSJC < to_date('2009-12-22','yyyy-MM-dd')

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select * from teaminfo t where to_char(RKSJC,'yyyy-MM-dd')='2009-12-21';


2
select * from teaminfo t where to_char(RKSJC,'yyyy-MM-dd') between '2009-12-21' and '2009-12-31';

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select * from teaminfo where to_char(rksjc,'yyyymmdd')='20091221'

between '2009-12-21' and '2009-12-31';

select * from teaminfo t where RKSJC>=to_date('2009-12-21','yyyy-MM-dd');


SQL code:
select * from teaminfo t where RKSJC=to_date('2009-12-21','yyyy-MM-dd');
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