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

1200+ customers in 80 countries

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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?
Medium SCHEMA car far Postgresql Syntax Schema Manipulation	Solve
What will the following PostgreSQL snippet output?
Medium Multi Select JOIN GROUP BY Sql Join Data Analysis	Solve
Consider the following SQL table: How many rows does the following SQL query return?
Medium nth highest sales Nested queries User Defined Functions	Solve
Consider the following SQL table: Which of the following SQL commands will find the ‘nth highest Sales’ if it exists (returns null otherwise)?
Medium Select & IN Nested queries	Solve
Consider the following SQL table: Which of the following SQL queries would return the year when neither a football or cricket winner was chosen?
Medium Sorting Ubers Nested queries Join Comparison operators	Solve
Consider the following SQL table: What will be the first two tuples resulting from the following SQL command?
Hard With, AVG & SUM MAX() MIN() Aggregate functions	Solve
Consider the following SQL table: How many tuples does the following query return?

	🧐 Question	🔧 Skill
	Easy DROP SUM bar	2 mins PostgreSQL	Solve
What will the following PostgresSQL snippet below output?
	Medium SCHEMA car far Postgresql Syntax Schema Manipulation	2 mins PostgreSQL	Solve
What will the following PostgreSQL snippet output?
	Medium Multi Select JOIN GROUP BY Sql Join Data Analysis	2 mins SQL	Solve
Consider the following SQL table: How many rows does the following SQL query return?
	Medium nth highest sales Nested queries User Defined Functions	3 mins SQL	Solve
Consider the following SQL table: Which of the following SQL commands will find the ‘nth highest Sales’ if it exists (returns null otherwise)?
	Medium Select & IN Nested queries	3 mins SQL	Solve
Consider the following SQL table: Which of the following SQL queries would return the year when neither a football or cricket winner was chosen?
	Medium Sorting Ubers Nested queries Join Comparison operators	3 mins SQL	Solve
Consider the following SQL table: What will be the first two tuples resulting from the following SQL command?
	Hard With, AVG & SUM MAX() MIN() Aggregate functions	2 mins SQL	Solve
Consider the following SQL table: How many tuples does the following query return?

	🧐 Question	🔧 Skill	💪 Difficulty	⌛ Time
	DROP SUM bar	PostgreSQL	Easy	2 mins	Solve
What will the following PostgresSQL snippet below output?
	SCHEMA car far Postgresql Syntax Schema Manipulation	PostgreSQL	Medium	2 mins	Solve
What will the following PostgreSQL snippet output?
	Multi Select JOIN GROUP BY Sql Join Data Analysis	SQL	Medium	2 mins	Solve
Consider the following SQL table: How many rows does the following SQL query return?
	nth highest sales Nested queries User Defined Functions	SQL	Medium	3 mins	Solve
Consider the following SQL table: Which of the following SQL commands will find the ‘nth highest Sales’ if it exists (returns null otherwise)?
	Select & IN Nested queries	SQL	Medium	3 mins	Solve
Consider the following SQL table: Which of the following SQL queries would return the year when neither a football or cricket winner was chosen?
	Sorting Ubers Nested queries Join Comparison operators	SQL	Medium	3 mins	Solve
Consider the following SQL table: What will be the first two tuples resulting from the following SQL command?
	With, AVG & SUM MAX() MIN() Aggregate functions	SQL	Hard	2 mins	Solve
Consider the following SQL table: How many tuples does the following query return?

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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:

Hidden AI Tools Detection with Honestly
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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