2 queries must return the same result (but they are not...)

Hello
I have a query:
select col1,extract(year from datum) yr, COUNT(*)
from tableA@dblink where
DATUM between '1-jan-1985' and '31-dec-2012'
and col2 > 100 and col2 not in ('999999')
and TRIM(TO_CHAR(col1)) in ('0','1')
group by col1,extract(year from DATUM);
the query above returns the number: 143 982 for the year 1991
However, when I put the filter directly in this year the request returns a different number: 143 917
select col1,extract(year from datum) yr, COUNT(*)
from tableA@dblink  where
DATUM between '1-jan-1991' and '31-dec-1991'
and col2 > 100 and col2 not in ('999999')
and TRIM(TO_CHAR(col1)) in ('0','1')
group by col1,extract(year from DATUM);
Please can you help me understand why what is happening and why these 2 heads are different?
ID appreciate any advice
Thank you very much
Rgds

Try these...

select col1,extract(year from datum) yr, COUNT(*)
from tableA@dblink where
trunc(DATUM) between to_date('1-jan-1985','dd-mon-yyyy') and to_date('31-dec-2012','dd-mon-yyyy')
and col2 > 100 and col2 not in ('999999')
and TRIM(TO_CHAR(col1)) in ('0','1')
group by col1,extract(year from DATUM);

select col1,extract(year from datum) yr, COUNT(*)
from tableA@dblink  where
trunc(DATUM) between to_date('1-jan-1991','dd-mon-yyyy') and to_date('31-dec-1991','dd-mon-yyyy')
and col2 > 100 and col2 not in ('999999')
and TRIM(TO_CHAR(col1)) in ('0','1')
group by col1,extract(year from DATUM);

Tags: Database

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