The number of attributes in relation is called as its .....................

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?

• [A] ALTER TABLE STUDENT ALTER CONSTRAINT GradeCheck (Grade > 0);
• [B] ALTER TABLE STUDENT ADD CONSTRAINT GradeCheck (Grade > 0);
• [C] ALTER TABLE STUDENT ADD CONSTRAINT GradeCheck CHECK (Grade > 0);
• [D] None of the above is correct.

what is the work of using joint operation in database??

................. requires that data should be made available to only authorized users.

• [A] Security
• [B] Data integrity
• [C] Privacy
• [D] none

The benefits of object-oriented modeling are which of the following?

• [A] The ability to tackle more challenging problems
• [B] Reusability of analysis, design, and programming results
• [C] Improved communication between users, analysts, etc.
• [D] All of the above.

.................. table store information about database or about the system

• [A] SQL
• [B] nested
• [C] system
• [D] none