Concatenar mensaje en RAISERROR

Question

¿Cuál es la sintaxis correcta aquí?

If (@timestamp < (Select PromoStartTimestamp From @promo)) 
    RAISERROR('Code not valid until ' + (Select PromoStartTimestamp From @promo) 
       ,16 
       ,1); 

He intentado:

If (@timestamp < (Select PromoStartTimestamp From @promo)) 
    RAISERROR(N'Code not valid until @starttimestamp' 
       ,16 
       ,1 
       ,(Select PromoStartTimestamp From @promo)); 

respuesta de

Michael Fredrickson me da un error de Incorrect syntax near 'CAST'.

Answer 1

Puede utilizar %s como un parámetro de sustitución de cadenas en RAISERROR:

DECLARE @PromoStartTimestamp DATETIME 
DECLARE @PromoStartTimestampString VARCHAR(50) 

SELECT @PromoStartTimestamp = PromoStartTimestamp From @promo 
SELECT @PromoStartTimestampString = CAST(@PromoStartTimestamp AS VARCHAR) 

If (@timestamp < @PromoStartTimestamp) 
    RAISERROR(N'Code not valid until %s' 
       ,16 
       ,1 
       ,@PromoStartTimestampString);