Database Redesign
Changing cardinalities in a database is:

is impossible to do, so a new database must be constructed and the data moved into it.
a common database design task.
a rare database design task, but does occur.
a database design task that never occurs.

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

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

All of these
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.

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