Maximum Number of Rows in a Dataframe

Guys,
I am new to R so please excuse if I am not very clear.

My problem is: I have a 'for' loop in which I am defining a Dataframe df
with a SQL query.
First iteration gives a df with 31 rows(that's correct), however next
iterations also gives me max rows as 31. It's kinda stuck at that value.

I might have to delete df(how to do that?) after ?every iteration or if
there is any other solution.

Thanks for your help,
Rushabh
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