SQL Server Optional Parameters

I am writing a stored proc for an SSRS report.  The user wants the report to bring back all the data on the first run and then allow the user to set 4 parameters.  I initially created the report to show nothing until the user selected parameters, but they want all data returned and then filter it out.  

I have four parameters  @LiveDate datetime = Null, @Status bit = Null,@CarType varchar(30) = NULL,@somethingelse varchar(30) = NULL

Then I have a select statement.  It the WHERE clause that I am confused about.  If the parameters are NULL, then I want to return everything  and if not then return according to the parameter values.

Can someone help me with the WHERE clause here.  

Thanks.
sherbug1015Asked:
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Shaun KlineLead Software EngineerCommented:
You can use the ISNULL function to handle this:
WHERE <Your Field> = ISNULL(@YourParam, <Your Field>)

Another method is:
WHERE (@YourParam IS NULL OR <Your Field> = @YourParam)
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Microsoft SQL Server 2008

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