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PostgreSQL Online Test

The PostgreSQL Online Test uses scenario-based MCQs to evaluate candidates on their knowledge of PostgreSQL, including their proficiency in SQL queries, database design, indexing, transactions, and stored procedures. The test aims to evaluate a candidate's ability to work with PostgreSQL databases effectively and develop applications that utilize PostgreSQL efficiently.

Covered skills:

  • SQL Basics
  • Database Management
  • Database Design
  • Data Manipulation
  • Data Modeling
  • Indexes
  • Transactions
  • Query Optimization
  • Performance Tuning
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About the PostgreSQL Test


The PostgreSQL Online 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:

  • Able to write complex SQL queries
  • Proficient in database management and optimization
  • Skilled in data manipulation and modeling
  • Knowledgeable in query optimization and performance tuning
  • Capable of designing efficient databases
  • Experienced with handling transactions
  • Familiar with basic SQL syntax and operations
  • Competent in implementing indexes for improved database performance

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Non-googleable 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 PostgreSQL Online Test will be non-googleable.

🧐 Question

Easy

DROP SUM bar
Solve
What will the following PostgresSQL snippet below output?
 image

Medium

SCHEMA car far
Postgresql Syntax
Schema Manipulation
Solve
What will the following PostgreSQL snippet output?
 image

Medium

Multi Select
JOIN
GROUP BY
Sql Join
Data Analysis
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

DROP SUM bar

2 mins

PostgreSQL
Solve

Medium

SCHEMA car far
Postgresql Syntax
Schema Manipulation

2 mins

PostgreSQL
Solve

Medium

Multi Select
JOIN
GROUP BY
Sql Join
Data Analysis

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
DROP SUM bar
PostgreSQL
Easy2 mins
Solve
SCHEMA car far
Postgresql Syntax
Schema Manipulation
PostgreSQL
Medium2 mins
Solve
Multi Select
JOIN
GROUP BY
Sql Join
Data Analysis
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
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Why you should use Pre-employment PostgreSQL Online Test?

The PostgreSQL Online Test makes use of scenario-based questions to test for on-the-job skills as opposed to theoretical knowledge, ensuring that candidates who do well on this screening test have the relavant skills. The questions are designed to covered following on-the-job aspects:

  • Ability to write complex SQL queries and perform advanced data manipulation
  • Experience in designing and managing databases using PostgreSQL
  • Understanding of data modeling concepts and ability to create efficient database schemas
  • Knowledge of database indexing techniques and their impact on query performance
  • Skills in optimizing queries for better performance and query execution time
  • Familiarity with transaction management and ability to ensure data integrity
  • Experience in query optimization and performance tuning of PostgreSQL databases
  • Ability to troubleshoot database performance issues and optimize database configurations
  • Knowledge of SQL basics and ability to write and execute basic SQL statements
  • Understanding of database management principles and practices

Once the test is sent to a candidate, the candidate receives a link in email to take the test. For each candidate, you will receive a detailed report with skills breakdown and benchmarks to shortlist the top candidates from your pool.

What topics are covered in the PostgreSQL Online Test?

SQL Basics: SQL Basics refers to the fundamental knowledge and understanding of the Structured Query Language (SQL) used for managing and manipulating data in relational databases. This skill is crucial as it forms the foundation for all other SQL-related tasks and ensures a solid understanding of database concepts.

Database Management: Database Management involves the administration and maintenance of a database system, including tasks such as user management, security, performance monitoring, and backup and recovery. Measuring this skill helps assess a candidate's ability to efficiently manage and organize large amounts of data while ensuring data integrity and security.

Database Design: Database Design refers to the process of creating a structured and efficient database schema that meets the requirements of the application. This skill is important as a well-designed database schema ensures optimal data retrieval and reduces complexity in data manipulation tasks.

Data Manipulation: Data Manipulation involves performing operations on data within a database, such as inserting, updating, and deleting records. Measuring this skill helps evaluate a candidate's ability to efficiently perform data manipulation tasks and ensures they have a good grasp on data modification operations.

Data Modeling: Data Modeling is the process of creating a conceptual representation of how data is structured within a database. This skill is essential as it helps in designing and understanding the relationships between different entities and attributes, which enables efficient data retrieval and analysis.

Indexes: Indexes are data structures that improve the performance of database queries by allowing faster data access. Measuring this skill helps assess a candidate's ability to optimize query performance by choosing and creating appropriate indexes based on query patterns and data distribution.

Transactions: Transactions ensure the integrity and consistency of data by providing a mechanism for grouping multiple database operations into a single logical unit. Measuring this skill helps evaluate a candidate's understanding of transaction management and their ability to ensure data integrity in multi-user environments.

Query Optimization: Query Optimization involves the process of selecting the most efficient execution plan for a given query, minimizing the time and resources required for query execution. Measuring this skill helps assess a candidate's ability to optimize query performance by understanding database query execution, index usage, and query rewriting techniques.

Performance Tuning: Performance Tuning involves identifying and resolving performance issues within a database system to improve query response times, throughput, and overall system efficiency. Measuring this skill helps evaluate a candidate's ability to analyze database performance metrics, identify bottlenecks, and apply optimization techniques to enhance system performance.

Full list of covered topics

The actual topics of the questions in the final test will depend on your job description and requirements. However, here's a list of topics you can expect the questions for PostgreSQL Online Test to be based on.

SQL Basics
Database Management
Database Design
Data Manipulation
Data Modeling
Indexes
Transactions
Query Optimization
Performance Tuning
Table Creation
Data Types
Constraints
SQL Operators
Aggregate Functions
Joins
Subqueries
Views
Stored Procedures
Triggers
Normalization
Data Integrity
Entity-Relationship Diagrams
Database Normal Forms
Query Execution Plan
Indexing Strategies
Locking
ACID Properties
Database Indexing
Optimizing Queries
Query Tuning
Query Rewriting
Database Sharding
Replication
Database Backup and Recovery
Database Schema Design
Table Partitioning
Concurrency Control
Deadlock Detection
Data Replication
Data Compression
Query Profiling
Database Monitoring
Database Caching
Database Security
Backup and Restore Strategies
Database Deployment
Database Migration
Data Backup
Data Restoration
Database Transactions
Database Locking
Database Concurrency
Database Isolation Levels
Database Performance Monitoring
Database Connection Pooling
Query Execution Time Optimization
Database Connection Management
Database Replication
SQL Injection
Database Clustering

What roles can I use the PostgreSQL Online Test for?

  • PostgreSQL Database Administrator
  • PostgreSQL Database Developer
  • Backend Developer
  • PostgreSQL Data Analyst

How is the PostgreSQL Online Test customized for senior candidates?

For intermediate/ experienced candidates, we customize the assessment questions to include advanced topics and increase the difficulty level of the questions. This might include adding questions on topics like

  • Proficiency in data manipulation techniques, such as filtering, sorting, and joining data
  • Ability to create and modify database tables, views, and indexes
  • Understanding of data modeling techniques and ability to design relational databases
  • Knowledge of SQL constraints and ability to implement them in database design
  • Skills in writing stored procedures, functions, and triggers in PostgreSQL
  • Familiarity with database backup and recovery strategies
  • Experience in implementing and maintaining data security in PostgreSQL databases
  • Understanding of database replication and ability to configure and manage replication
  • Proficiency in database monitoring and performance analysis
  • Knowledge of PostgreSQL extensions and ability to leverage them for advanced functionality
  • Skills in troubleshooting database errors, anomalies, and data inconsistencies

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Have questions about the PostgreSQL Hiring Test?

What is PostgreSQL Online Test?

The PostgreSQL Online Test is designed to evaluate a candidate's proficiency in PostgreSQL and SQL. It is used by recruiters to assess skills in database management, data modeling, and query optimization, among others.

Can I combine the PostgreSQL Online Test with SQL-related questions?

Yes, recruiters can request a single custom test with multiple skills. For assessing SQL skills, consider our SQL Online Test for more details.

What skills are assessed in the PostgreSQL Online Test?

The test covers SQL Basics, Database Management, Design, Data Manipulation, Modeling, Indexes, Transactions, Query Optimization, and Performance Tuning. For senior roles, it evaluates proficiency in data manipulation, database design, stored procedures, data security, and troubleshooting.

How to use the PostgreSQL Online Test in my hiring process?

We recommend using this test as a pre-screening tool. Add a link to the assessment in your job post or invite candidates via email. This helps filter out skilled candidates early.

Can I test PostgreSQL and SQL together in one test?

Yes, you can. We have C#, .NET & SQL Test that combines multiple skills. This combo test is recommended for comprehensive assessment.

What are the main Database tests?

Here are some important database tests:

Can I combine multiple skills into one custom assessment?

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.

Do you have any anti-cheating or proctoring features in place?

We have the following anti-cheating features in place:

  • Non-googleable questions
  • IP proctoring
  • Screen proctoring
  • Web proctoring
  • Webcam proctoring
  • Plagiarism detection
  • Secure browser
  • Copy paste protection

Read more about the proctoring features.

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.

What experience level can I use this test for?

Each Adaface assessment is customized to your job description/ ideal candidate persona (our subject matter experts will pick the right questions for your assessment from our library of 10000+ questions). This assessment can be customized for any experience level.

Does every candidate get the same questions?

Yes, it makes it much easier for you to compare candidates. Options for MCQ questions and the order of questions are randomized. We have anti-cheating/ proctoring features in place. In our enterprise plan, we also have the option to create multiple versions of the same assessment with questions of similar difficulty levels.

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.

What is the cost of using this test?

You can check out our pricing plans.

Can I get a free trial?

Yes, you can sign up for free and preview this test.

I just moved to a paid plan. How can I request a custom assessment?

Here is a quick guide on how to request a custom assessment on Adaface.

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Along with scorecards that report the performance of the candidate in detail, you also receive a comparative analysis against the company average and industry standards.

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