sql server - how to get all rows using a specific value in parameter -


are there way rows in clause if parameter have specific value

example if boltpattern = should return 

|   boltpattern |  ----------------- |   5x117    |  |   5x117    |  |   5x120    |  |   5x125    |

else if boltpattern = 5x117 should return

|   boltpattern |  ----------------- |   5x117    |  |   5x117    |

my storedprocedure

alter procedure [data].[usp_filterdata]          @boltpattern nvarchar(1000)=null,                 set nocount on select p.[boltpattern] [data].[wheeldata] p          @boltpattern null or p.[boltpattern]=@boltpattern

if want extract records when @boltpattern null can use:

where  @boltpattern null or boltpattern=@boltpattern , @boltpattern not null

if want extract records when @boltpattern ='all' can use:

where  @boltpattern ='all' or boltpattern=@boltpattern , @boltpattern <>'all'

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