Database Redesign
What SQL command will allow you to change the table STUDENT to add the constraint named GradeCheck that states that the values of the Grade column must be greater than 0?

None of these
ALTER TABLE STUDENT ALTER CONSTRAINT GradeCheck (Grade > 0);
ALTER TABLE STUDENT ADD CONSTRAINT GradeCheck CHECK (Grade > 0);
ALTER TABLE STUDENT ADD CONSTRAINT GradeCheck (Grade > 0);

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Database Redesign
Before any changes to database structure are attempted one should first:

clearly understand the current structure and contents of the database only.
All of these
test any changes on a test database only.
create a complete backup of the operational database only.

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