Database Redesign
Which is not true of a correlated subquery?

EXISTS/NOT EXISTS is a form of a correlated subquery.
They can be used to verify functional dependencies.
The processing of the SELECT statements is nested.
They are very similar to a regular subquery.

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

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Database Redesign
Changing cardinalities in a database is:

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

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