declare @a nvarchar(max) =
replicate(cast(N'X'as nvarchar(max)),4000)
declare @b nvarchar(max) =
replicate(cast(N'X'as nvarchar(max)),40000)
select datalength(@a);select datalength(@b)
select hashbytes('SHA2_256',@a),hashbytes('SHA2_256',@b)
where hashbytes('SHA2_256',@a)<>hashbytes('SHA2_256',@b)