Database Design Using Normalization(1st)

Proper normalization eliminates duplicated data.

1 Mark(s)

True
False

When building a database from an existing set of tables, we may safely assume that referential integrity constraints have been enforced on the data we are given.

1 Mark(s)

True
False

Needing to assess the validity of assumed referential integrity constraints on foreign keys is a(n) ________ of normalization.

1 Mark(s)

disadvantage
either an advantage or disadvantage
advantage
neither an advantage nor disadvantage

Each answer below shows example data from a table. Which answer is an example of the inconsistent values problem?

1 Mark(s)

Three rows have the values Brown, NULL, and Blue in the same column.
One row has the value,He is interested in a Silver Porsche from the years 1978-1988 in a column.
Three rows have the values Brown Small Chair, Small Chair Brown, and Small Brown Chair in the same column.
Three columns have the values 534-2435, 534-7867, and 546-2356 in the same row.

When assessing the table structure of an acquired set of tables with data, determining primary keys is (part of) the:

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third step.
fourth step.
first step.
second step.

When assessing the table structure of an acquired set of tables with data, determining foreign keys is (part of) the:

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first step.
fourth step.
third step.
second step.

One common design problem when designing a database from existing data is the presence of inconsistent values in the received data.

1 Mark(s)

False
True

When assessing the table structure of an acquired set of tables with data, determining functional dependencies is (part of) the:

1 Mark(s)

third step.
first step.
second step.
fourth step.

Needing to using more complicated SQL in database applications is a(n) ________ of normalization.

1 Mark(s)

advantage
neither an advantage nor disadvantage
disadvantage
either an advantage or disadvantage

When you are given a set of tables and asked to create a database to store their data, the first step is to create the new database.

1 Mark(s)

True
False

The phrase "SALE.CNumber must exist in CUSTOMER.CNumber" is a referential integrity constraint.

1 Mark(s)

False
True

Most of the time, modification anomalies are serious enough that tables should be normalized into:

1 Mark(s)

BCNF.
2NF.
1NF.
3NF.

When assessing the table structure of an acquired set of tables with data, accessing the validity of possible referential integrity constraints on foreign keys is (part of) the:

1 Mark(s)

first step.
fourth step.
second step.
third step.

Each answer below shows example data from a table. Which answer is an example of the multivalue, multicolumn problem?

1 Mark(s)

One row has the value,He is interested in a Silver Porsche from the years 1978-1988 in a column.
Three columns have the values 534-2435, 534-7867, and 546-2356 in the same row.
Three rows have the values Brown Small Chair, Small Chair Brown, and Small Brown Chair in the same column.
Three rows have the values Brown, NULL, and Blue in the same column.

Read-only databases are ________ updated.

1 Mark(s)

never
always
commonly
seldom

Creating a read-only database is a task that is ________ assigned to beginning database professionals.

1 Mark(s)

seldom
always
commonly
never

Normalization ________ data duplication.

1 Mark(s)

eliminates
reduces
maximizes
increases

Denormalized tables are in BCNF.

1 Mark(s)

False
True

Each answer below shows example data from a table. Which answer is an example of the general-purpose remarks column problem?

1 Mark(s)

Three rows have the values Brown, NULL, and Blue in the same column.
One row has the value, He is interested in a Silver Porsche from the years 1978-1988 in a column.
Three rows have the values Brown Small Chair, Small Chair Brown, and Small Brown Chair in the same column.
Three columns have the values 534-2435, 534-7867, and 546-2356 in the same row.

For a number of reasons, normalizations is not often an advantage for a(n) ________ database.

1 Mark(s)

either a read-only or an updateable
None of the above is correct
read-only
updateable

Each answer below shows example data from a table. Which answer is an example of the missing values problem?

1 Mark(s)

Three rows have the values Brown, NULL, and Blue in the same column.
One row has the value,He is interested in a Silver Porsche from the years 1978-1988 in a column.
Three columns have the values 534-2435, 534-7867, and 546-2356 in the same row.
Three rows have the values Brown Small Chair, Small Chair Brown, and Small Brown Chair in the same column.

If a table has been normalized so that all determinants are candidate keys, then that table is in:

1 Mark(s)

2NF.
3NF.
1NF.
BCNF.

When building a database from an existing set of tables, we still need to consider normalization principles.

1 Mark(s)

False
True

In all cases, normalization into BCNF is desirable.

1 Mark(s)

True
False

Normalization requires programmers to write more complex SQL.

1 Mark(s)

False
True

One common design problem when designing a database from existing data is the use of a general-purpose remarks column in the received data.

1 Mark(s)

False
True

We can eliminate modification anomalies with proper normalization that results in tables in BCNF.

1 Mark(s)

False
True

Most of the time, modification anomalies cause problems that are severe enough that a table should be normalized into BCNF.

1 Mark(s)

True
False

Eliminating modification anomalies is a(n) ________ of normalization.

1 Mark(s)

advantage
either an advantage or disadvantage
disadvantage
neither an advantage nor disadvantage

One common design problem when designing a database from existing data is the presence of missing values, called blank values, in received data.

1 Mark(s)

False
True

Using the SQL GROUP BY phrase with a SELECT statement can help detect which of the following problems?

1 Mark(s)

The inconsistent values problem
The general-purpose remarks column problem
The missing values problem
The multivalue, multicolumn problem

We use the SQL construct COUNT(*) to count the number of rows in a table.

1 Mark(s)

False
True

The design guidelines and priorities for read-only databases are different because read-only databases are never updated.

1 Mark(s)

True
False

Multivalued dependencies should ________ be eliminated.

1 Mark(s)

seldom
commonly
always
never

When building a database from an existing set of tables, we may safely assume that there are no multivalued dependencies in the data we are given.

1 Mark(s)

True
False

Multivalued dependencies create harmless anomalies that should be noted, but do not always need to be eliminated.

1 Mark(s)

False
True

One common design problem when designing a database from existing data is the use of a single cell in one column to store multiple values of an attribute.

1 Mark(s)

False
True

When assessing the table structure of an acquired set of tables with data, counting the number of table rows is (part of) the:

1 Mark(s)

first step.
second step.
fourth step.
third step.

We use the SQL construct COLUMNS(*) to determine the number and type of columns in a table.

1 Mark(s)

False
True

We have normalized a table into BCNF if all candidate keys are determinants.

1 Mark(s)

True
False

Database Design Using Normalization(1st) : Question 1 of 40