在线等待，请高手批点！
select sum(namount)-(@inta+@intb)) as sscommisoin, (@inta+@intb) as commisoin ,sum(namount) allnamount,invoice_no
from pcinvoicedetail with(nolock) where invoice_no=@invoiceno group by invoice_no

@inta=0 @intb=760,在运行时(@inta+@intb) as commisoin竟等于空，为什么会为空，之前写在存储过程还好好的。请高手指点，谢谢！

[解决办法]
存储过程中给@inta赋值后加一句
select @inta = isnull(@inta,0)