ISYS 209 FINAL EXAM NEWEST 2026 ACTUAL EXAM:
COMPLETE 200 REAL EXAM QUESTIONS AND CORRECT
VERIFIED ANSWERS WITH DETAILED RATIONALES -
ALREADY GRADED A+ | MOST RECENT UPDATED ISYS
209 FINAL EXAM REVIEW WITH EVERY CONCEPT
COVERED
ISYS 209 FINAL EXAM REVIEW
SECTION 1: DATABASE CONCEPTS & ER
DIAGRAMS
1. In an entity-relationship (ER) diagram, which
symbol represents an entity?
• A) Circle
• B) Rectangle
• C) Diamond
• D) Line
Correct ☑VERIFIED ANSWER: B
Rationale: In ER diagrams, entities (tables) are
,represented by rectangles. Attributes are ovals
(or circles), relationships are diamonds, and
lines connect entities to relationships.
2. In an ER diagram, which symbol represents a
relationship?
• A) Circle
• B) Rectangle
• C) Diamond
• D) Line
Correct ☑VERIFIED ANSWER: C
Rationale: Relationships such as "enrolls in" or
"works for" are represented by diamonds in ER
diagrams.
3. Which of the following best describes a
primary key?
• A) A field that allows duplicate values
, • B) A field that uniquely identifies each
record in a table
• C) A field that can be null
• D) A field that references another table
Correct ☑VERIFIED ANSWER: B
Rationale: A primary key uniquely identifies
each row/record in a table. It must contain
unique, non-null values. Option D describes a
foreign key.
4. A foreign key in a table must match which of
the following in another table?
• A) Any indexed column
• B) A primary key or unique key
• C) Any column with the same name
• D) A column that allows nulls
, Correct ☑VERIFIED ANSWER: B
Rationale: A foreign key references a primary
key or unique key in another table to enforce
referential integrity. It does not require
matching column names.
5. What is the main purpose of normalization
in database design?
• A) To increase data redundancy
• B) To reduce data redundancy and avoid
update anomalies
• C) To make queries run faster
• D) To encrypt sensitive data
Correct ☑VERIFIED ANSWER: B
Rationale: Normalization reduces data
redundancy and avoids update anomalies. It
can actually slow down queries because it
increases the number of JOINs required.
COMPLETE 200 REAL EXAM QUESTIONS AND CORRECT
VERIFIED ANSWERS WITH DETAILED RATIONALES -
ALREADY GRADED A+ | MOST RECENT UPDATED ISYS
209 FINAL EXAM REVIEW WITH EVERY CONCEPT
COVERED
ISYS 209 FINAL EXAM REVIEW
SECTION 1: DATABASE CONCEPTS & ER
DIAGRAMS
1. In an entity-relationship (ER) diagram, which
symbol represents an entity?
• A) Circle
• B) Rectangle
• C) Diamond
• D) Line
Correct ☑VERIFIED ANSWER: B
Rationale: In ER diagrams, entities (tables) are
,represented by rectangles. Attributes are ovals
(or circles), relationships are diamonds, and
lines connect entities to relationships.
2. In an ER diagram, which symbol represents a
relationship?
• A) Circle
• B) Rectangle
• C) Diamond
• D) Line
Correct ☑VERIFIED ANSWER: C
Rationale: Relationships such as "enrolls in" or
"works for" are represented by diamonds in ER
diagrams.
3. Which of the following best describes a
primary key?
• A) A field that allows duplicate values
, • B) A field that uniquely identifies each
record in a table
• C) A field that can be null
• D) A field that references another table
Correct ☑VERIFIED ANSWER: B
Rationale: A primary key uniquely identifies
each row/record in a table. It must contain
unique, non-null values. Option D describes a
foreign key.
4. A foreign key in a table must match which of
the following in another table?
• A) Any indexed column
• B) A primary key or unique key
• C) Any column with the same name
• D) A column that allows nulls
, Correct ☑VERIFIED ANSWER: B
Rationale: A foreign key references a primary
key or unique key in another table to enforce
referential integrity. It does not require
matching column names.
5. What is the main purpose of normalization
in database design?
• A) To increase data redundancy
• B) To reduce data redundancy and avoid
update anomalies
• C) To make queries run faster
• D) To encrypt sensitive data
Correct ☑VERIFIED ANSWER: B
Rationale: Normalization reduces data
redundancy and avoids update anomalies. It
can actually slow down queries because it
increases the number of JOINs required.
