Data Engineering Program Quiz 2

Data Engineering Quiz 2

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1. Which of the following SQL clauses is used to remove duplicate records from a query result?

HAVING

LIMIT

DISTINCT

GROUP BY

2. What is the primary purpose of database indexing in relational databases?

To enforce referential integrity

To normalize data structures

To reduce storage space used by tables

To improve the performance of data retrieval

3. In PostgreSQL, which type of index is best suited for text search operations?

GIN (Generalized Inverted Index)

B-Tree Index

Hash Index

GiST (Generalized Search Tree)

4. Which of the following best describes the difference between MySQL and PostgreSQL?

MySQL is optimized for complex queries, while PostgreSQL is better for transactional processing

PostgreSQL provides more advanced support for concurrency and ACID compliance than MySQL

PostgreSQL lacks support for NoSQL-like features, while MySQL supports them extensively

MySQL supports JSON documents natively, while PostgreSQL does not

5. In Microsoft SQL Server, what is the purpose of the execution plan?

To automate the process of query writing

To analyze and optimize the way queries are executed

To visualize table relationships in a database

To store historical query results for future use

6. Which of the following is NOT a key advantage of NoSQL databases over relational databases?

Strong ACID compliance

Schema flexibility

High performance with unstructured data

Horizontal scalability

7. Which NoSQL database model is best suited for storing hierarchical relationships?

Column-Family Stores

Document Stores

Key-Value Stores

Graph Databases

8. When choosing a database for real-time analytics on massive streaming data, which option is most appropriate?

MongoDB

Apache Cassandra

PostgreSQL

MySQL

9. In a distributed NoSQL database, what is the main purpose of data sharding?

To partition data across multiple nodes for better scalability

To perform automatic backups of the database

To ensure high availability by replicating data

To enforce strong consistency across all nodes

10. What is a common trade-off when using NoSQL databases instead of relational databases?

Stronger consistency but lower performance

Less efficient storage due to rigid table structures

Reduced flexibility in schema design

Weaker consistency in favor of scalability

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Data Engineering Program Quiz 2

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