Ohh ... Thanks Gabor. I have a few related queries then, kindly have a look:

1. Does it only hinder the sqldf package or are there other issues with
using POSIXlt in a dataframe? Am asking because I have a few dataframes
with columns of class(POSIXlt ).

2. I have columns containing 'date+timestamp', something like '2011-01-03
09:07:07' which are of class POSIXlt. I need to perform some arithmetic
operations on these columns. Which class would be most appropriate for such
kind of data?

Thanks and Regards,
Shivam

On Thu, May 10, 2012 at 4:45 AM, Gabor Grothendieck <ggrothendieck@gmail.com
> wrote:

> On Wed, May 9, 2012 at 5:58 PM, Shivam <shivamsingh@gmail.com> wrote:
> > Hi All,
> >
> > I am having trouble executing SQL statements on a few dataframes, but the
> > funny thing is that I am able to execute the statement on some other
> > dataframes.
> >
>
> Never put POSIXlt objects into data frames.
>
> --
> Statistics & Software Consulting
> GKX Group, GKX Associates Inc.
> tel: 1-877-GKX-GROUP
> email: ggrothendieck at gmail.com
>



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