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?

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

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Database Redesign
The EXISTS keyword will be true if:

all rows in the subquery fail the condition only.
neither of these two conditions is met.
both of these two conditions are met.
any row in the subquery meets the condition only.

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