Date comparison

Hi All,

            I've a date column in a oracle db table which stores date and time values.
Is it advisable to use a date variable directly in a comparison with a date column
without any formatting or using any other conversion functions like to_char.

here the date variable also stores the date & time part from the table .

e.g

select * from <table a>
where <date_column> = <date_variable>

Regards
Manoj

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