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Database Redesign Questions

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Choose the correct option.

Adding null columns to a table is straightforward.


ATRUE

BFALSE

Answer: Option A

Explanation:

Here is no explanation for this answer

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


Adrop the primary key.

Bdrop the table containing the foreign key.

Cdrop the foreign key constraint.

DAll of the above must be done.

Answer: Option C

Explanation:

Here is no explanation for this answer

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A correlated subquery is processed as a nested subquery.


ATRUE

BFALSE

Answer: Option A

Explanation:

Here is no explanation for this answer

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What SQL command can be used to add columns to a table?


AMODIFY TABLE

BMODIFY TABLE

CALTER TABLE

DALTER TABLE

Answer: Option D

Explanation:

Here is no explanation for this answer

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The process of reading a database schema and producing a data model from that schema is known as:


Adata modeling.

Bdatabase design.

Creverse engineering.

DNone of the above is correct.

Answer: Option C

Explanation:

Here is no explanation for this answer

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The data model that is produced from reverse engineering is:


Aa conceptual model.

Ban internal model.

Ca logical model.

DNone of the above is correct.

Answer: Option D

Explanation:

Here is no explanation for this answer

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Changing cardinalities in a database is:


Aa common database design task.

Ba rare database design task, but does occur.

Ca database design task that never occurs.

Dis impossible to do, so a new database must be constructed and the data moved into it.

Answer: Option A

Explanation:

Here is no explanation for this answer

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The data model produced from the reverse engineering process does not include intersection table data.


ATRUE

BFALSE

Answer: Option B

Explanation:

Here is no explanation for this answer

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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?


AALTER TABLE STUDENT ALTER CONSTRAINT GradeCheck (Grade > 0);

BALTER TABLE STUDENT ADD CONSTRAINT GradeCheck (Grade > 0);

CALTER TABLE STUDENT ADD CONSTRAINT GradeCheck CHECK (Grade > 0);

DNone of the above is correct

Answer: Option C

Explanation:

Here is no explanation for this answer

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Which SQL-92 standard SQL command can be used to change a table name?


ARENAME TABLE

BCHANGE TABLE

CALTER TABLE

DNone of the above is correct.

Answer: Option D

Explanation:

Here is no explanation for this answer

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