Top Data Modeling Interview Question and Answers for 2022

It goes without saying that if you want to ace your next job interview, you must first ensure that your credentials are worthy. There is, however, more you can do to help tip the scales in your favor. Yes, knowing what you're doing is important, but so is being prepared.
 
In this case, we're talking about being prepared for the questions you'll almost certainly be asked during the interview. All the knowledge in the world won't help you if you don't know how to put it to use. You can review the content and be prepared with the best responses if you know what kinds of questions you'll be asked.

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1. What is a Data Model?

A data model organizes and standardizes the relationships between data items and real-world entity attributes. As a result, data modeling is logically defined as the act of developing certain data models.
 
Entities are the items and concepts whose data we want to track, while entities are the objects and concepts whose data we want to track. They become tables in a database as a result. Potential entities include customers, products, manufacturers, and sellers.
 
Each entity has attributes, which are details that users want to keep track of. A customer's name, for example, is a characteristic.
 
Now that we've cleared that up, let's look at those data modeling interview questions!

2. Basic Data Modeling Interview Questions

1. What Are the Three Types of Data Models?

The three types of data models are as follows:

• The framework or schema explains how data is physically stored in the database in the physical data model.
• This approach concentrates on the high-level, user's perspective of the data in question.
• Logical data models straddle the line between physical and theoretical data models, allowing logical data representation to exist independently of physical storage.

2: What is a Table?

A table is made up of rows and columns of data. Data is shown in vertical alignment in columns, also known as fields. The horizontal alignment of data is represented by rows, often known as a record or tuple.

3. What is Normalization?

The practice of structuring a database in such a way that it decreases data redundancy while maintaining integrity is known as database normalization.

4. What Does a Data Modeler Use Normalization For?

The following are the goals of normalization:

• Remove any data that is no longer needed or relevant.
• Data complexity should be reduced.
• In addition to the data in the tables, make sure there are relationships between them.
• Make sure there are no data dependencies and that the information is kept appropriately.

5. So, What is Denormalization, and What is its Purpose?

Denormalization is a technique for adding redundant data to a database that has already been normalized. By compromising write efficiency, the process improves read performance.

6. What Does ERD Stand for, and What is it?

The entity Relationship Diagram (ERD) is a logical entity representation that defines relationships between entities. Boxes contain entities, while arrows represent relationships.

7. What’s the Definition of a Surrogate Key?

The numerical properties are enforced by a surrogate key, often known as a primary key. Natural keys are replaced by this surrogate key. Data modelers generate the surrogate key instead of primary or composite primary keys, which is a useful tool for identifying records, generating SQL queries, and improving speed.

8. What Are the Critical Relationship Types Found in a Data Model? Describe Them.

The following are the most common forms of relationships:
 

• Identifying. In most cases, a relationship line joins the parent and child tables. However, if the reference column of a child table is part of the primary key of the parent table, the tables are linked by a thick line, indicating an identifiable relationship.
• Non-identifying. The tables are connected by a dotted line, indicating a no-identifying relationship, if the reference column of a child table is not part of the table's primary key.
• Self-recursive. A recursive relationship is a single column in a table that is linked to the table's primary key.

9. What is an Enterprise Data Model?

This is a data model that consists of all the entries required by an enterprise.