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

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

ANSWER DOWNLOAD EXAMIANS APP

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 ADD CONSTRAINT GradeCheck (Grade > 0);
ALTER TABLE STUDENT ADD CONSTRAINT GradeCheck CHECK (Grade > 0);
ALTER TABLE STUDENT ALTER CONSTRAINT GradeCheck (Grade > 0);

ANSWER DOWNLOAD EXAMIANS APP