SQL Server parameters

I want to use this SP with either having just 2 parameters like Patient Name, Patient LAst Namer or either Patient Name, Last Name, DOB or having the 4 all together.
Now, is working having mandatory all of 4, but the query would be having 2, 3 or 4.
What is the change that have to be done on this SP, thanks for your help.

ALTER PROCEDURE [dbo].[Get_Patients] 
	@PatientName varchar(50),
	@PatientLastName varchar(50),
	@PatientGender varchar(1),
	@PatientDOB date

	select	PatientID as Id, PatientName AS [Name],PatientLastName as [Last Name],PatientGender as Gender ,PatientDOB as [Date of Birth]
	from	Patients
			PatientName			= @PatientName and
			PatientLastName		= @PatientLastName and
			PatientGender		= @PatientGender and 
			PatientDOB			= @PatientDOB 
	ORDER BY PatientID	

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Aneesh RetnakaranDatabase AdministratorCommented:
ALTER PROCEDURE [dbo].[Get_Patients]
      @PatientName varchar(50) = NULL,
      @PatientLastName varchar(50) = NULL,
      @PatientGender varchar(1)= NULL ,
      @PatientDOB date = NULL

      select      PatientID as Id, PatientName AS [Name],PatientLastName as [Last Name],PatientGender as Gender ,PatientDOB as [Date of Birth]
      from      Patients
                  (@PatientName  is null or PatientName                  = @PatientName) and
                  (@PatientLastName is null or PatientLastName            = @PatientLastName) and
                  (@PatientGender is null or PatientGender            = @PatientGender ) and
                  (@PatientDOB is null or PatientDOB                  = @PatientDOB )
      ORDER BY PatientID      

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Brian CroweDatabase AdministratorCommented:
Default the "optional" parameters to NULL and change your where cluase to:

WHERE PatientName = ISNULL(@PatientName, PatientName)
   AND PatientLastName = ISNULL(@PatientLastName, PatientLastName)
   AND PatientGender = ISNULL(@PatientGender, PatientGender)
   AND PatientDOB = ISNULL(@PatientDOB, PatientDOB)
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Microsoft SQL Server

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