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Database Redesign

Database Redesign
The SQL-92 command to change a table name is RENAME TABLE.

False
True

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Database Redesign
The NOT EXISTS keyword will be true if:

any row in the subquery meets the condition.
all rows in the subquery fail the condition.
neither of these two conditions is met.
both of these two conditions are met.

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Database Redesign
Dependency graphs are diagrams that consist of nodes and arcs that show the dependencies of a database.

True
False

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Database Redesign
Adding null columns to a table is straightforward.

True
False

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Database Redesign
Which of the following modifications may not succeed?

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

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Database Redesign
Which of the following SQL statements are helpful in database redesign?

None of these
EXISTS/NOT EXISTS expressions only
Correlated subqueries only
Both of the above are helpful

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