sql - oracle to_date function not accepting format -

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when in oracle 10g:

select to_date(trunc(someinputdate)) table1 to_date(trunc(date_column_timestamp),'mm/dd/yyyy')   >= to_date('03/11/2011' ,'mm/dd/yyyy')

i get: ora-01843: not valid month if change : 'yyyy/mm/dd', works. 'mm/dd/yyyy' valid format right?

you're getting things mixed bit. to_date converts string date. if date_column_timestamp date, don't need convert date.

select trunc(someinputdate) table1 trunc(date_column_timestamp)   >= to_date('03/11/2011' ,'mm/dd/yyyy')

the ora-01843 caused implicit conversion of date string. in other words, following:

to_date(trunc(date_column_timestamp),'mm/dd/yyyy')

is equivalent (assuming default date format dd-mon-yyyy):

to_date(to_char(trunc(date_column_timestamp),'dd-mon-yyyy'),'mm/dd/yyyy')

so, to_char returns '11-mar-2011', causes to_date fail because date formats not match.

the same problem exists in select clause. don't need to_date around trunc of date column.


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