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Data Modeling Skills Test

The Data Modeling Skills Test evaluates a candidate's knowledge and abilities in database design, SQL, ER diagrams, normalization, relational schema, data integrity, data mapping, data warehousing, data manipulation, data validation, and data transformation.

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Screen candidates with a 40 mins test

Test duration:  40 mins
Difficulty level:  Moderate
Availability:  Ready to use
Questions:
  • 10 Data Modeling MCQs
  • 5 SQL MCQs
Covered skills:
Data modeling
Database design
SQL
ER diagrams
Normalization
Relational schema
Data integrity
Data mapping
Data validation
Data transformation
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Use the Data Modeling Skills Assessment Test to shortlist qualified candidates

The Data Modeling Skills Test helps recruiters and hiring managers identify qualified candidates from a pool of resumes, and helps in taking objective hiring decisions. It reduces the administrative overhead of interviewing too many candidates and saves time by filtering out unqualified candidates at the first step of the hiring process.

The test screens for the following skills that hiring managers look for in candidates:

  • Ability to create effective data models to represent complex business requirements
  • Proficiency in SQL queries for data manipulation and retrieval
  • Understanding of ER diagrams to visualize and design database structures
  • Knowledge of normalization techniques to optimize database performance and reduce redundancy
  • Ability to design relational schemas for efficient data storage and retrieval
  • Understanding of data integrity constraints to maintain data accuracy and consistency
  • Proficiency in data mapping techniques to establish relationships between data elements
  • Knowledge of data validation techniques to ensure data integrity and quality
  • Ability to perform data transformation operations for data integration and reporting
  • Understanding of data modeling principles and methodologies for effective data representation
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Screen candidates with the highest quality questions

We have a very high focus on the quality of questions that test for on-the-job skills. Every question is non-googleable and we have a very high bar for the level of subject matter experts we onboard to create these questions. We have crawlers to check if any of the questions are leaked online. If/ when a question gets leaked, we get an alert. We change the question for you & let you know.

How we design questions

These are just a small sample from our library of 15,000+ questions. The actual questions on this Data Modeling Skills Test will be non-googleable.

🧐 Question

Easy

Healthcare System
Data Integrity
Normalization
Referential Integrity
Solve
You are designing a data model for a healthcare system with the following requirements:
 image
A: A separate table for each entity with foreign keys as specified, and a DoctorPatient table linking Doctors to Patients.
B: A separate table for each entity with foreign keys as specified, without additional tables.
C: A combined PatientDoctor table replacing Patient and Doctor, and separate tables for Appointment and Prescription.
D: A separate table for each entity with foreign keys, and a PatientPrescription table to track prescriptions directly linked to patients.
E: A single table combining Patient, Doctor, Appointment, and Prescription into one.
F: A separate table for each entity with foreign keys as specified, and an AppointmentDetails table linking Appointments to Prescriptions.

Hard

ER Diagram and minimum tables
ER Diagram
Solve
Look at the given ER diagram. What do you think is the least number of tables we would need to represent M, N, P, R1 and R2?
 image
 image
 image

Medium

Normalization Process
Normalization
Database Design
Anomaly Elimination
Solve
Consider a healthcare database with a table named PatientRecords that stores patient visit information. The table has the following attributes:

- VisitID
- PatientID
- PatientName
- DoctorID
- DoctorName
- VisitDate
- Diagnosis
- Treatment
- TreatmentCost

In this table:

- Each VisitID uniquely identifies a patient's visit and is associated with one PatientID.
- PatientID is associated with exactly one PatientName.
- Each DoctorID is associated with a unique DoctorName.
- TreatmentCost is a fixed cost based on the Treatment.

Evaluating the PatientRecords table, which of the following statements most accurately describes its normalization state and the required actions for higher normalization?
A: The table is in 1NF. To achieve 2NF, remove partial dependencies by separating Patient information (PatientID, PatientName) and Doctor information (DoctorID, DoctorName) into different tables.
B: The table is in 2NF. To achieve 3NF, remove transitive dependencies by creating separate tables for Patients (PatientID, PatientName), Doctors (DoctorID, DoctorName), and Visits (VisitID, PatientID, DoctorID, VisitDate, Diagnosis, Treatment, TreatmentCost).
C: The table is in 3NF. To achieve BCNF, adjust for functional dependencies such as moving DoctorName to a separate Doctors table.
D: The table is in 1NF. To achieve 3NF, create separate tables for Patients, Doctors, and Visits, and remove TreatmentCost as it is a derived attribute.
E: The table is in 2NF. To achieve 4NF, address any multi-valued dependencies by separating Visit details and Treatment details.
F: The table is in 3NF. To achieve 4NF, remove multi-valued dependencies related to VisitID.

Medium

University Courses
ER Diagrams
Complex Relationships
Integrity Constraints
Solve
 image
Based on the ER diagram, which of the following statements is accurate and requires specific knowledge of the ER diagram's details?
A: A Student can major in multiple Departments.
B: An Instructor can belong to multiple Departments.
C: A Course can be offered by multiple Departments.
D: Enrollment records can link a Student to multiple Courses in a single semester.
E: Each Course must be associated with an Enrollment record.
F: A Department can offer courses without having any instructors.

Medium

Multi Select
JOIN
GROUP BY
Solve
Consider the following SQL table:
 image
How many rows does the following SQL query return?
 image

Medium

nth highest sales
Nested queries
User Defined Functions
Solve
Consider the following SQL table:
 image
Which of the following SQL commands will find the ‘nth highest Sales’ if it exists (returns null otherwise)?
 image

Medium

Select & IN
Nested queries
Solve
Consider the following SQL table:
 image
Which of the following SQL queries would return the year when neither a football or cricket winner was chosen?
 image

Medium

Sorting Ubers
Nested queries
Join
Comparison operators
Solve
Consider the following SQL table:
 image
What will be the first two tuples resulting from the following SQL command?
 image

Hard

With, AVG & SUM
MAX() MIN()
Aggregate functions
Solve
Consider the following SQL table:
 image
How many tuples does the following query return?
 image
🧐 Question🔧 Skill

Easy

Healthcare System
Data Integrity
Normalization
Referential Integrity

2 mins

Data Modeling
Solve

Hard

ER Diagram and minimum tables
ER Diagram

2 mins

Data Modeling
Solve

Medium

Normalization Process
Normalization
Database Design
Anomaly Elimination

3 mins

Data Modeling
Solve

Medium

University Courses
ER Diagrams
Complex Relationships
Integrity Constraints

2 mins

Data Modeling
Solve

Medium

Multi Select
JOIN
GROUP BY

2 mins

SQL
Solve

Medium

nth highest sales
Nested queries
User Defined Functions

3 mins

SQL
Solve

Medium

Select & IN
Nested queries

3 mins

SQL
Solve

Medium

Sorting Ubers
Nested queries
Join
Comparison operators

3 mins

SQL
Solve

Hard

With, AVG & SUM
MAX() MIN()
Aggregate functions

2 mins

SQL
Solve
🧐 Question🔧 Skill💪 Difficulty⌛ Time
Healthcare System
Data Integrity
Normalization
Referential Integrity
Data Modeling
Easy2 mins
Solve
ER Diagram and minimum tables
ER Diagram
Data Modeling
Hard2 mins
Solve
Normalization Process
Normalization
Database Design
Anomaly Elimination
Data Modeling
Medium3 mins
Solve
University Courses
ER Diagrams
Complex Relationships
Integrity Constraints
Data Modeling
Medium2 mins
Solve
Multi Select
JOIN
GROUP BY
SQL
Medium2 mins
Solve
nth highest sales
Nested queries
User Defined Functions
SQL
Medium3 mins
Solve
Select & IN
Nested queries
SQL
Medium3 mins
Solve
Sorting Ubers
Nested queries
Join
Comparison operators
SQL
Medium3 mins
Solve
With, AVG & SUM
MAX() MIN()
Aggregate functions
SQL
Hard2 mins
Solve

Test candidates on core Data Modeling Skills Hiring Test topics

Data Modeling: Data modeling is the process of designing and organizing data to support efficient storage and retrieval. It involves identifying the entities, relationships, and attributes in a system and creating a conceptual, logical, and physical model. Measuring data modeling skills in this test helps assess a candidate's ability to understand and structure complex data.

Database Design: Database design is the process of creating a blueprint for organizing and structuring data in a database system. It involves defining tables, relationships, constraints, and indexes to ensure efficient data storage and retrieval. Measuring database design skills in this test helps evaluate a candidate's ability to design databases that are scalable, optimized, and maintainable.

SQL: SQL (Structured Query Language) is a programming language used to manage and manipulate relational databases. It allows users to create, modify, and retrieve data from database tables. Measuring SQL skills in this test helps assess a candidate's proficiency in writing efficient and accurate SQL queries for data retrieval and manipulation.

ER Diagrams: An Entity-Relationship (ER) diagram is a visual representation of entities, attributes, and relationships in a database system. It helps illustrate the structure and organization of data. Measuring ER diagram skills in this test helps evaluate a candidate's ability to design clear and accurate ER diagrams, which are essential for database understanding and communication.

Normalization: Normalization is a process of minimizing redundancy and dependency in database tables to improve data integrity and reduce data anomalies. It involves dividing a database into logical, well-structured tables and establishing relationships between them. Measuring normalization skills in this test helps gauge a candidate's understanding of data normalization concepts and their ability to design efficient and normalized database schemas.

Relational Schema: A relational schema is a blueprint that defines the structure and organization of a relational database. It includes the names of tables, columns, constraints, and relationships. Measuring relational schema skills in this test helps assess a candidate's ability to design logical and coherent database schemas, which are crucial for data organization and retrieval.

Data Integrity: Data integrity refers to the accuracy, consistency, and reliability of data stored in a database. It is maintained through the use of constraints, validations, and business rules. Measuring data integrity skills in this test helps evaluate a candidate's understanding of maintaining data quality and preventing data corruption or loss.

Data Mapping: Data mapping involves defining the relationships and transformations between different data formats, structures, or systems. It is often used during data integration or migration projects. Measuring data mapping skills in this test helps assess a candidate's ability to map and transform data accurately and efficiently, ensuring seamless data flow and integration.

Data Validation: Data validation is the process of ensuring that data meets specific criteria or standards for accuracy, consistency, and usability. It includes checking data against predefined rules, constraints, or patterns. Measuring data validation skills in this test helps gauge a candidate's ability to design and implement robust data validation mechanisms, ensuring data quality and reliability.

Data Transformation: Data transformation involves converting data from one format, structure, or representation to another. It may include data cleansing, formatting, and restructuring. Measuring data transformation skills in this test helps evaluate a candidate's proficiency in transforming and manipulating data, which is often required for data integration, migration, or analysis tasks.

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Have questions about the Data Modeling Skills Hiring Test?

How does pricing work?

You can check out our pricing plans.

Can I customize the test?

Yes, absolutely. Custom assessments are set up within 48 hours based on your job description, and will include questions on all must-have skills you specify. Here's a quick guide on how you can request a custom test. You can also customize a test by uploading your own questions.

Can I combine multiple skills into one test?

Yes, absolutely. Custom assessments are set up based on your job description, and will include questions on all must-have skills you specify. Here's a quick guide on how you can request a custom test.

What roles can I use the Data Modeling Skills Assessment Test for?

Here are few roles for which we recommend this test:

  • Data Analyst
  • Database Administrator
  • Data Engineer
  • Business Analyst
  • Data Scientist
  • Software Engineer
  • Full Stack Developer
  • ETL Developer
  • Data Architect
  • BI Developer
Can I see a sample test, or do you have a free trial?

Yes!

The free trial includes one sample technical test (Java/ JavaScript) and one sample aptitude test that you will find in your dashboard when you sign up. You can use it to review the quality of questions and the candidate experience of giving a test on Adaface.

You can preview any of the 500+ tests and see the sample questions to decide if it would be a good fit for your requirements.

How do I interpret test scores?

The primary thing to keep in mind is that an assessment is an elimination tool, not a selection tool. A skills assessment is optimized to help you eliminate candidates who are not technically qualified for the role, it is not optimized to help you find the best candidate for the role. So the ideal way to use an assessment is to decide a threshold score (typically 55%, we help you benchmark) and invite all candidates who score above the threshold for the next rounds of interview.

I'm a candidate. Can I try a practice test?

No. Unfortunately, we do not support practice tests at the moment. However, you can use our sample questions for practice.

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