Is there any benefit in restricting a numeric field in Postgres? E.g.: numeric(70,0) instead of numeric

Question

I'm working with large integer numbers, which I currently represent in PG using numeric(x, 0). I don't want to think about x each time, so I'm wondering:

Is there any benefit (storage, performance, etc.) to use numeric(x, 0) instead of just the generic numeric?

Answer 1

Constrained numeric(x,0) is used to ensure that numbers are rounded to one, regardless of the format in which they are entered.

select 1.8::numeric(50,0)

 numeric
---------
       2
(1 row)

When it comes to performance, the difference between the use of constrained and unconstrained numerics is negligible.