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Database Redesign Questions

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Choose the correct option.

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


ACorrelated subqueries only

BEXISTS/NOT EXISTS expressions only

CBoth of the above are helpful

DNone of the above are helpful.

Answer: Option C

Explanation:

Here is no explanation for this answer

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Choose the correct option.

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


ATRUE

BFALSE

Answer: Option B

Explanation:

Here is no explanation for this answer

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Which of the following modifications may not succeed?


AChanging a column data type from char to date

BChanging a column data type from numeric to char

CBoth of the above actions should succeed

DNeither of the above actions will succeed.

Answer: Option A

Explanation:

Here is no explanation for this answer

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A regular subquery is processed from the bottom up.


ATRUE

BFALSE

Answer: Option A

Explanation:

Here is no explanation for this answer

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Typically, there should be at least two different copies of the database schema used in the redesign process.


ATRUE

BFALSE

Answer: Option B

Explanation:

Here is no explanation for this answer

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Database redesign is especially difficult if the database has no data.


ATRUE

BFALSE

Answer: Option B

Explanation:

Here is no explanation for this answer

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Choose the correct option.

The NOT EXISTS keyword will be true if:


Aany row in the subquery meets the condition.

Ball rows in the subquery fail the condition.

Cboth of these two conditions are met.

Dneither of these two conditions is met.

Answer: Option B

Explanation:

Here is no explanation for this answer

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


ATRUE

BFALSE

Answer: Option A

Explanation:

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Choose the correct option.

Correlated subqueries are similar to a regular subquery.


ATRUE

BFALSE

Answer: Option B

Explanation:

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Which is not true of a correlated subquery?


AEXISTS/NOT EXISTS is a form of a correlated subquery.

BThe processing of the SELECT statements is nested.

CThey can be used to verify functional dependencies.

DThey are very similar to a regular subquery.

Answer: Option D

Explanation:

Here is no explanation for this answer

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