Database Redesign
To drop a column that is used as a foreign key, first:

drop the primary key.
drop the table containing the foreign key.
All of these
drop the foreign key constraint.

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Database Redesign
Which is not true of a correlated subquery?

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

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