100% satisfaction guarantee Immediately available after payment Both online and in PDF No strings attached
logo-home
Previously searched by you
Previously searched by you
logo
WGU C170 Prerequisite pretest Exam training Questions with Rated A + Marking Scheme Latest 2024/2025 $11.49
Add to cart
Quickly navigate to
Preview
  2.  
  3. WGU 170
  4.  
  5. WGU 170

Exam (elaborations)

WGU C170 Prerequisite pretest Exam training Questions with Rated A + Marking Scheme Latest 2024/2025
 0 purchase
  • Course
  • WGU 170
  • Institution
  • WGU 170

WGU C170 Prerequisite pretest Exam training Questions with Rated A + Marking Scheme Latest 2024/2025 AREA - correct answer In DB2, a named section of permanent storage space that is reserved to store the database. associative entity - correct answer See composite entity. bridge entity - co...

[Show more]

Preview 3 out of 17  pages

Document information

  • August 30, 2024
  • 17
  • 2024/2025
  • Exam (elaborations)
  • Questions & answers

Subjects

Written for

  • WGU 170
  • WGU 170

Seller

avatar-seller
KieranKent55

Reviews received

Content preview

WGU C170 Prerequisite pretest Exam training
Questions with Rated A + Marking Scheme
Latest 2024/2025

AREA - correct answer In DB2, a named section of permanent storage space that is
reserved to store the database.


associative entity - correct answer See composite entity.


bridge entity - correct answer See composite entity.


candidate key - correct answer A minimal superkey; that is, a key that does not contain
a subset of attributes that is itself a superkey. See key.


closure - correct answer A property of relational operators that permits the use of
relational algebra operators on existing tables (relations) to produce new relations.


composite entity - correct answer An entity designed to transform an M:N relationship
into two 1:M relationships. The composite entity's primary key comprises at least the
primary keys of the entities that it connects. Also known as a bridge entity or associative
entity. See also linking table.


composite key - correct answer A multiple-attribute key.


dependent - correct answer An attribute whose value is determined by another
attribute.


determination - correct answer The role of a key. In the context of a database table, the
statement "A determines B" indicates that knowing the value of attribute A means that
the value of attribute B can be looked up.

,DIFFERENCE - correct answer In relational algebra, an operator used to yield all rows
from one table that are not found in another union-compatible table.


DIVIDE - correct answer In relational algebra, an operator that answers queries about
one set of data being associated with all values of data in another set of data.


domain - correct answer In data modeling, the construct used to organize and describe
an attribute's set of possible values.


entity integrity - correct answer The property of a relational table that guarantees each
entity has a unique value in a primary key and that the key has no null values.


equijoin - correct answer A join operator that links tables based on an equality
condition that compares specified columns of the tables.


flags - correct answer Special codes implemented by designers to trigger a required
response, alert end users to specified conditions, or encode values. Flags may be used
to prevent nulls by bringing attention to the absence of a value in a table.


foreign key (FK) - correct answer An attribute or attributes in one table whose values
must match the primary key in another table or whose values must be null. See key.


full functional dependence - correct answer A condition in which an attribute is
functionally dependent on a composite key but not on any subset of the key.


functional dependence - correct answer Within a relation R, an attribute B is
functionally dependent on an attribute A if and only if a given value of attribute A
determines exactly one value of attribute B. The relationship "B is dependent on A" is
equivalent to "A determines B," and is written as A B.


homonyms - correct answer The use of the same name to label different attributes.
Homonyms generally should be avoided. Some relational software automatically checks

, for homonyms and either alerts the user to their existence or automatically makes the
appropriate adjustments. See also synonym.


index - correct answer An ordered array of index key values and row ID values
(pointers). Indexes are generally used to speed up and facilitate data retrieval. Also
known as an index key.


index key - correct answer See index.


inner join - correct answer A join operation in which only rows that meet a given
criterion are selected. The join criterion can be an equality condition (natural join or
equijoin) or an inequality condition (theta join). The inner join is the most commonly
used type of join. Contrast with outer join.


INTERSECT - correct answer In relational algebra, an operator used to yield only the
rows that are common to two union-compatible tables.


JOIN - correct answer In relational algebra, a type of operator used to yield rows from
two tables based on criteria. There are many types of joins, such as natural join, theta
join, equijoin, and outer join.


join columns - correct answer Columns that are used in the criteria of join operations.
The join columns generally share similar values (have a compatible domain).


key - correct answer One or more attributes that determine other attributes. See also
superkey, candidate key, primary key (PK), secondary key, and foreign key.


key attribute - correct answer The attributes that form a primary key. See also prime
attribute.


left outer join - correct answer In a pair of tables to be joined, a join that yields all the
rows in the left table, including those that have no matching values in the other table.
For example, a left outer join of CUSTOMER with AGENT will yield all of the

The benefits of buying summaries with Stuvia:

Guaranteed quality through customer reviews

Guaranteed quality through customer reviews

Stuvia customers have reviewed more than 700,000 summaries. This how you know that you are buying the best documents.

Quick and easy check-out

Quick and easy check-out

You can quickly pay through credit card or Stuvia-credit for the summaries. There is no membership needed.

Focus on what matters

Focus on what matters

Your fellow students write the study notes themselves, which is why the documents are always reliable and up-to-date. This ensures you quickly get to the core!

Frequently asked questions

What do I get when I buy this document?

You get a PDF, available immediately after your purchase. The purchased document is accessible anytime, anywhere and indefinitely through your profile.

Satisfaction guarantee: how does it work?

Our satisfaction guarantee ensures that you always find a study document that suits you well. You fill out a form, and our customer service team takes care of the rest.

Who am I buying these notes from?

Stuvia is a marketplace, so you are not buying this document from us, but from seller KieranKent55. Stuvia facilitates payment to the seller.

Will I be stuck with a subscription?

No, you only buy these notes for $11.49. You're not tied to anything after your purchase.

Can Stuvia be trusted?

4.6 stars on Google & Trustpilot (+1000 reviews)

69052 documents were sold in the last 30 days

Founded in 2010, the go-to place to buy study notes for 15 years now

Start selling
$11.49
  • (0)
Add to cart
Added