Oracle-9i field Numeric 13,2 select retrun TLargeIntField

[scribes]

Hi All
When I make one select in a field of the type to number 13,2 it returns as being a TLargeIntField type with this it does not come back the decimals If inside of select use the command to_num(filed) it to returns the type Float
To some form to make this without having that to use to_num?
I am using delphi 7 in XP Professional SP2

Grateful

Thanks

Edmilson