PRINTing problem

Hi

I write following code in SQL server 2005

DECLARE @ttvarchar(20)

DECLARE @uuvarchar(20)

SET @uu='variable'

PRINT'This is printed'

PRINT'This is not printed'+ @tt+'This is not printed'

PRINT'This is printed '+ @uu+' This is printed '

OUTPUT:

This is printed

This is printed variable This is printed

Why the Second print command don’t print

(I know @tt variable is not initialized, if I initialized @tt variable then every thing is fine)

WHY?

Regards,

Thanks.

Gurpreet S. Gill

[3742 byte] By [GurpreetSinghGill] at [2007-12-22]