Question: In oracle sql, how do I add not null constraint at end of create table block and give it a name without using the CHECK

In oracle sql, how do I add "not null constraint" at end of create table block and give it a name without using the CHECK constraint?

Is it e.g., CONSTRAINT constraintName NOT NULL

If so, then how does the statement know which columnName I'm referring to to make NOT NULL?

I know that I can do this after declaring the column, what I'm wondering about is how to do this after declaring all the columns.

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