CREATE TABLE [dbo].[t3] (

[n1] [int] not null,

[n2] [int] not null,

[n3] as n1 + n2 ,

[n4] as n1 * n2

CONSTRAINT [t3_unique_key] unique (n3,n4)

)

Create 2 computed columns n3,n4 as shown below. declare unique key constraint on it.

That shd detect the following scenario.