Optional Date parameters in SQL Command

I'm using Crystal Reports 2008. I want to make the start and end date parameters optional and have them default to the beginning and end of the previous month. Unfortunately, I'm using an SQL Command, rather than filtering in the Record Selection Formula, and I can't see any way to pass the computed start and end dates into the query. Is there any way to get the results I want short of omitting the date parameter in the query and doing all the filtering on the front end? Thanks.

The way I have gotten around this problem is to make the date parameters strings, and allow mnemonics such as PM for prior month, PD for prior day, PQ for prior quarter, etc. I then wrote Crystal and database functions that convert these mnemonics to actual dates, which are then used where necessary. This is also useful for scheduling the same report to run weekly (for the prior week), monthly (for the prior month) and quarterly (for the prior quarter)...
Also, remember that an SQL command in Crystal is basically the equivalent of a stored procedure, so you can do a lot of logic in them before returning your data set. So, in your SQL, you could set a variable to either the parameter value or a calculated prior month dependent on if the date parameter is null (assuming Crystal allows no entry for the parameter, which I think 2008 does [I'm on XI R2]).
HTH,
Carl

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Optional Date parameters in SQL Command

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