COG220 ACCESS DATA MODEL PRACTICE EXAM COMPLETE PRACTICE EXAM
WITH DETAILED ANSWERS | 2026–2027 LATEST UPDATE | FULL STUDY GUIDE |
EXAM PREP | PRACTICE TEST | CERTIFICATION PREPARATION
1. In a healthcare access data model, what is the primary purpose of a fact table?
A. Store descriptive attributes about providers
B. Store measurable business events linked to dimensions
C. Store security permissions only
D. Store user interface settings
Fact tables capture measurable events such as appointments, encounters, or registrations and
reference dimension tables through foreign keys. Dimension tables provide the descriptive
context for those events.
2. Which type of table typically contains descriptive information such as department names,
provider specialties, or patient demographics?
A. Fact table
B. Transaction log
C. Dimension table
D. Audit table
Dimension tables provide descriptive attributes that help categorize and analyze facts. They
allow reports to group and filter business data efficiently.
3. A data analyst wants to determine how many patient encounters occurred by department
during the previous month. Which data model structure best supports this analysis?
A. Flat file
B. Spreadsheet
C. Star schema
D. Hierarchical file structure
A star schema simplifies reporting by connecting a central fact table to multiple dimension
tables. This structure supports efficient analytical queries.
, 4. A foreign key primarily exists to:
A. Encrypt patient records
B. Delete duplicate data
C. Create relationships between related tables
D. Improve report formatting
Foreign keys establish relationships between tables while maintaining referential integrity.
They allow related records to be joined accurately.
5. During report development, why is understanding table relationships essential?
A. It improves monitor resolution.
B. It changes database security.
C. It ensures accurate retrieval of related data.
D. It reduces network bandwidth.
Proper table relationships prevent duplicate records and incorrect query results. Analysts must
understand how tables connect before creating reports.
6. Which SQL operation combines rows from related tables using common fields?
A. Sort
B. Filter
C. JOIN
D. Aggregate
JOIN operations combine related records from multiple tables using matching key values.
They are fundamental to relational database reporting.
7. Which key uniquely identifies each row within a table?
A. Foreign key
B. Composite key
C. Primary key
, D. Secondary key
Every table should contain a primary key that uniquely identifies each record. This prevents
ambiguity and supports reliable relationships.
8. A report returns duplicate encounter records after several tables are joined. What is the
most likely cause?
A. Missing indexes
B. Incorrect join conditions
C. Insufficient storage
D. Invalid passwords
Improper joins frequently create duplicate rows because multiple records match
unintentionally. Reviewing relationship logic usually resolves the issue.
9. Why are dimension tables generally smaller than fact tables?
A. They contain encrypted data.
B. They store only temporary information.
C. They describe business entities rather than transactional events.
D. They cannot contain text.
Dimension tables change less frequently and store descriptive information. Fact tables often
contain millions of transactional records collected over time.
10. A healthcare analyst needs the total number of appointments by provider. Which SQL
function is most appropriate?
A. MIN()
B. AVG()
C. COUNT()
D. ROUND()
COUNT() determines the number of qualifying records. It is commonly used when
summarizing encounters, appointments, or registrations.
WITH DETAILED ANSWERS | 2026–2027 LATEST UPDATE | FULL STUDY GUIDE |
EXAM PREP | PRACTICE TEST | CERTIFICATION PREPARATION
1. In a healthcare access data model, what is the primary purpose of a fact table?
A. Store descriptive attributes about providers
B. Store measurable business events linked to dimensions
C. Store security permissions only
D. Store user interface settings
Fact tables capture measurable events such as appointments, encounters, or registrations and
reference dimension tables through foreign keys. Dimension tables provide the descriptive
context for those events.
2. Which type of table typically contains descriptive information such as department names,
provider specialties, or patient demographics?
A. Fact table
B. Transaction log
C. Dimension table
D. Audit table
Dimension tables provide descriptive attributes that help categorize and analyze facts. They
allow reports to group and filter business data efficiently.
3. A data analyst wants to determine how many patient encounters occurred by department
during the previous month. Which data model structure best supports this analysis?
A. Flat file
B. Spreadsheet
C. Star schema
D. Hierarchical file structure
A star schema simplifies reporting by connecting a central fact table to multiple dimension
tables. This structure supports efficient analytical queries.
, 4. A foreign key primarily exists to:
A. Encrypt patient records
B. Delete duplicate data
C. Create relationships between related tables
D. Improve report formatting
Foreign keys establish relationships between tables while maintaining referential integrity.
They allow related records to be joined accurately.
5. During report development, why is understanding table relationships essential?
A. It improves monitor resolution.
B. It changes database security.
C. It ensures accurate retrieval of related data.
D. It reduces network bandwidth.
Proper table relationships prevent duplicate records and incorrect query results. Analysts must
understand how tables connect before creating reports.
6. Which SQL operation combines rows from related tables using common fields?
A. Sort
B. Filter
C. JOIN
D. Aggregate
JOIN operations combine related records from multiple tables using matching key values.
They are fundamental to relational database reporting.
7. Which key uniquely identifies each row within a table?
A. Foreign key
B. Composite key
C. Primary key
, D. Secondary key
Every table should contain a primary key that uniquely identifies each record. This prevents
ambiguity and supports reliable relationships.
8. A report returns duplicate encounter records after several tables are joined. What is the
most likely cause?
A. Missing indexes
B. Incorrect join conditions
C. Insufficient storage
D. Invalid passwords
Improper joins frequently create duplicate rows because multiple records match
unintentionally. Reviewing relationship logic usually resolves the issue.
9. Why are dimension tables generally smaller than fact tables?
A. They contain encrypted data.
B. They store only temporary information.
C. They describe business entities rather than transactional events.
D. They cannot contain text.
Dimension tables change less frequently and store descriptive information. Fact tables often
contain millions of transactional records collected over time.
10. A healthcare analyst needs the total number of appointments by provider. Which SQL
function is most appropriate?
A. MIN()
B. AVG()
C. COUNT()
D. ROUND()
COUNT() determines the number of qualifying records. It is commonly used when
summarizing encounters, appointments, or registrations.
