Database Redesign
What SQL command can be used to delete columns from a table?

ALTER TABLE TableName DROP ColumnName
MODIFY TABLE TableName DROP COLUMN ColumnName
ALTER TABLE TableName DROP COLUMN ColumnName
MODIFY TABLE TableName DROP ColumnName

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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.
The processing of the SELECT statements is nested.
EXISTS/NOT EXISTS is a form of a correlated subquery.

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