Question

what is not null constrain ?​

Answer 1

Answer:

A NOT NULL constraint in SQL is used to prevent inserting NULL values into the specified column, considering it as a not accepted value for that column. This means that you should provide a valid SQL NOT NULL value to that column in the INSERT or UPDATE statements, as the column will always contain data.

Answer 2

Answer:

A not Null

Explanation:

SQL,NUL

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