Database Redesign
Which of the following modifications may not succeed?

Changing a column data type from char to date
Changing a column data type from numeric to char
Neither of the above actions will succeed
Both of the above actions should succeed

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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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