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Stored procedure query with if

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Last Modified: 2016-08-31
Hello,
How can i add a validation in the query below :
             
	 	@Ref nvarchar(20)= NULL,
	@BookingType nvarchar(50)= NULL,
	@CorresType nvarchar(50)= NULL,
	@Date nvarchar(20) =NULL,
    @SentTo nvarchar(50) =NULL,
	@Attention nvarchar (255)= NULL,
	@FaxNumber nvarchar(50)= NULL,
	@Regarding nvarchar(255)= NULL,
	@Authority  nvarchar (50)= NULL,
	@SentBy nvarchar (50) =NULL,
	@Comments nvarchar(255)= NULL,	
	@RequestedBy nvarchar (255)= NULL,
	@GuestName nvarchar(255)= NULL,
	@RoomTypeRouting nvarchar(50)= NULL,
	@ArrivalDate VARCHAR(20)= NULL,	
	@DurationofStay nvarchar(50) =NULL,
	@Extendedto nvarchar(20)= NULL,
	@ConfirmationNumber nvarchar(255)= NULL,
	@e_UID Nvarchar(MAX)=null
	 


 INSERT INTO DEBUG(SQL) VALUES ( 'UPDATE  table1
		(
			   [Ref]
      ,[BookingType]
      ,[CorresType]    
      ,[SentTo]
      ,[Attention]
      ,[FaxNumber]
      ,[Regarding]
      ,[Authority]
      ,[SentBy]
      ,[Comments]    
      ,[RequestedBy]
      ,[GuestName]
      ,[RoomTypeRouting]
      ,[ArrivalDate]
      ,[DurationofStay]
      ,[Extendedto]
	  ,[Date]
      ,[ConfirmationNumber]   
		) 
		VALUES
		(
			''' +@Ref + ''' )
			  '''+ @BookingType + ''' ),
			'''+@CorresType +''' ),		
		    '''+@SentTo +''' ),
			'''+@Attention +''' ),
			'''+@FaxNumber + ''')
			'''+@Regarding + '''),
			'''+@Authority +''' ),
			'''+@Comments +''' ),
			'''+@SentBy +''' ),
			'''+@Comments +''' ),
			'''+@RequestedBy +''' ),
			'''+@GuestName +''' )
			'''+@RoomTypeRouting +''' )
		    '''+@ArrivalDate +''' )
		    '''+@DurationofStay +''' )
validation required [b]if @extendedto is not ''[/b]
				'''+@Extendedto +''' )
				    WHERE [e_UID] =''' + @e_UID + '''')	
			
	  

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