how to display report in table format.
how to convert number 1,2 3 (part of date string) to jan feb etc on crystal report. dates are stored as string in database.

You'll need to create a formula to extract the month from the date. This will supply you a number for the month. Then you'll need to make an If-Then-Else formula to name the months:

NumberVar Mth:= Month(DateField);

If Mth = 1 then "Jan" else
If Mth = 2 then "Feb" else

etc.