Question

is it possible to add a NULL or NOT NULL vonstraint to a table already located with data
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Answer 1

Answer:

Yes, we can add not null column to table already containing data, provided that column should not contain null values. If that column contains null values, then it is not possible to add constraint.

(Hope it helps!)

Answer 2

Answer:

Yes, we can add not null column to table already containing data, provided that column should not contain null values. If that colmn contains null values, then it is not possible to add constraint.

Hope it helps