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DS0-001 · topic practice

Database Structures And SQL practice questions

Practise CompTIA DataSys+ (DS0-001) (DS0-001) Database Structures And SQL practice questions — original exam-style scenarios with answer choices, explanations, and analysis of common mistakes.

Courseiva uses original exam-style practice questions designed for learning and revision. The goal is to understand the concepts, recognise exam patterns, and improve through explanations — not memorise copied exam dumps.

Reviewed byJohnson Ajibi· MSc IT Security

20 questionsDomain: Database Structures And SQL

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What the exam tests

What to know about Database Structures And SQL

Database Structures And SQL questions test whether you can apply the concept in context, not just recognise a definition.

How the topic appears in realistic exam-style scenarios.

Which detail in the question changes the correct answer.

How to eliminate plausible but wrong options.

How to connect the question back to the wider exam objective.

Watch out for

Common Database Structures And SQL exam traps

▸Answering from memory before reading the full scenario.
▸Missing a constraint such as cost, availability, security, scope or command context.
▸Choosing a broad answer when the question asks for the most specific fix.
▸Ignoring why the wrong options are tempting.

Practice set

Database Structures And SQL questions

20 questions · select your answer, then reveal the explanation

Question 1mediummultiple choice

Read the full Database Structures And SQL explanation →

A database administrator needs to store unstructured data that scales horizontally across multiple servers while maintaining high availability. Which database structure should be selected?

Trap 1: Relational (RDBMS)

Relational databases rely on normalized schemas and vertical scaling.

Trap 2: Network

Network databases use a graph-like structure that is difficult to scale horizontally.

Trap 3: Hierarchical

Hierarchical databases use a tree-like structure, which is not optimized for modern horizontal scaling.

Study all Database Structures And SQL common traps →

A
Relational (RDBMS)
Why wrong: Relational databases rely on normalized schemas and vertical scaling.
B
NoSQL (Document Store)
NoSQL databases provide the flexibility for unstructured data and distributed horizontal scaling.
C
Network
Why wrong: Network databases use a graph-like structure that is difficult to scale horizontally.
D
Hierarchical
Why wrong: Hierarchical databases use a tree-like structure, which is not optimized for modern horizontal scaling.

Database Structures And SQL practice questions

What to know about Database Structures And SQL

Common Database Structures And SQL exam traps

Database Structures And SQL questions

A database administrator needs to store unstructured data that scales horizontally across multiple servers while maintaining high availability. Which database structure should be selected?

A user wants to add a new column to an existing table named 'Employees'. Which SQL statement should be executed?

To improve read performance on a table frequently queried by a specific column, which database object should be created?

A database administrator is investigating performance degradation during heavy concurrent write operations. Which isolation level provides the highest level of data consistency but the lowest concurrency?

A developer needs to ensure that a 'Customer_ID' field in a 'Orders' table always references a valid ID in the 'Customers' table. Which constraint should be applied?

Which SQL command is used to permanently remove all rows from a table while keeping the table definition intact?

Which type of join should be used to return all records from the 'Left' table and only matching records from the 'Right' table?

An analyst is writing an SQL query to retrieve total sales per region, but the result must only show regions with more than 100 transactions. Which clause is required?

Which SQL keyword is used to eliminate duplicate values from a query result set?

Which DML statement is used to update existing records in a database table?

A database developer needs to combine the results of two different SELECT queries into a single result set. Which operator should be used?

An application requires an automatic timestamp for every row inserted into an 'Audit' table. Which feature should the developer implement?

When migrating data between two different relational databases, which DDL-related issue is most likely to cause failure if ignored?

To prevent unauthorized access to specific columns in a 'Salary' table, which object should be created for the reporting team?

A business user needs to calculate the average age of customers, but some age fields are NULL. Which function should be used to treat NULL as 0?

A transaction involves multiple updates that must either all succeed or all fail. Which command ensures this behavior?

Which command is used to restrict a user's access to a specific table?

Which NoSQL structure is best suited for scenarios where data relationships are complex and frequently traversed?

Which operator is used to search for a pattern in a string column?

An application is experiencing deadlocks. Which strategy would effectively reduce the frequency of deadlocks?

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