Selection of Records - date data

SELECT	show_name, show_address
FROM	show
-----------------------------------------------
show_name       show_addressDubbo	        23 Wingewarra St, Dubbo
Young	        13 Cherry Lane, YoungCastle Hill	Showground Rd, Castle Hill
Royal Easter	PO Box 13, GPO Sydney
Dubbo	        17 Fitzroy St, Dubbo

Hi I'm trying to select Dubbo at 'Wingewarra St' and Castel Hill and list the number of days between them

Dubbo at 'Wingewarra St' was held on 05/ July / 1995 and Castle Hill was held on 04/ May/ 1996 and the result should be 304 days

and here is the show table:

SELECT * 
FROM show
---------------------------------------------------------
show_name     show_held     show_address
Dubbo	      1995-07-05    23  Wingewarra St, Dubbo
Young	      1995-09-13    13  Cherry Lane, Young
Castle Hill   1996-05-04    Showground Rd, Castle Hill
Royal Easter  1996-04-21    PO Box 13, GPO Sydney
Dubbo	      1996-07-01    17 Fitzroy St, Dubbo

and Here is the code that I wrote:

SELECT		DATENAME (DAY, show_held.CastleHill) - DATENAME (DAY, show_held.Dubbo) AS number_of_days_between_show
FROM		show
WHERE		show.show_name = 'Dubbo' AND show.show_address LIKE 'Wingewarra St'

-----------------------------------------------------
Msg 4104, Level 16, State 1, Line 24
The multi-part identifier "show_held.CastleHill" could not be bound.
Msg 4104, Level 16, State 1, Line 24
The multi-part identifier "show_held.Dubbo" could not be bound.

I have no idea how to only select the day for Castle Hill and subtract the day of Dubbo that was held at Wingewarra St

Please help thank you