Is it possible to not specify the dimensions of the columns? What does it threaten?

P

pqgg7nwkd42016-11-12 13:39:17

PostgreSQL

pqgg7nwkd4, 2016-11-12 13:39:17

Good afternoon.
What can threaten me if I do not specify dimensions for columns of such types as VARCHAR, NUMERIC (DECIMAL), TIMESTAMP?
I want to leave control over this at the mercy of the application.
Thank you.

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