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About the 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 Design
  • Data Modeling
  • Transactions
  • Performance Tuning
  • Database Management
  • Data Manipulation
  • Indexes
  • Query Optimization

9 reasons why
9 reasons why

Adaface PostgreSQL Test is the most accurate way to shortlist PostgreSQL Database Administrators



Reason #1

Tests for on-the-job skills

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
Reason #2

No trick questions

no trick questions

Traditional assessment tools use trick questions and puzzles for the screening, which creates a lot of frustration among candidates about having to go through irrelevant screening assessments.

View sample questions

The main reason we started Adaface is that traditional pre-employment assessment platforms are not a fair way for companies to evaluate candidates. At Adaface, our mission is to help companies find great candidates by assessing on-the-job skills required for a role.

Why we started Adaface
Reason #3

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 10,000+ 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
Solve
What will the following PostgreSQL snippet output?
 image

Medium

Multi Select
JOIN
GROUP BY
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

2 mins

PostgreSQL
Solve

Medium

Multi Select
JOIN
GROUP BY

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
Medium2 mins
Solve
Multi Select
JOIN
GROUP BY
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
Reason #4

1200+ customers in 75 countries

customers in 75 countries
Brandon

With Adaface, we were able to optimise our initial screening process by upwards of 75%, freeing up precious time for both hiring managers and our talent acquisition team alike!


Brandon Lee, Head of People, Love, Bonito

Reason #5

Designed for elimination, not selection

The most important thing while implementing the pre-employment PostgreSQL Online Test in your hiring process is that it is an elimination tool, not a selection tool. In other words: you want to use the test to eliminate the candidates who do poorly on the test, not to select the candidates who come out at the top. While they are super valuable, pre-employment tests do not paint the entire picture of a candidate’s abilities, knowledge, and motivations. Multiple easy questions are more predictive of a candidate's ability than fewer hard questions. Harder questions are often "trick" based questions, which do not provide any meaningful signal about the candidate's skillset.

Science behind Adaface tests
Reason #6

1 click candidate invites

Email invites: You can send candidates an email invite to the PostgreSQL Online Test from your dashboard by entering their email address.

Public link: You can create a public link for each test that you can share with candidates.

API or integrations: You can invite candidates directly from your ATS by using our pre-built integrations with popular ATS systems or building a custom integration with your in-house ATS.

invite candidates
Reason #7

Detailed scorecards & benchmarks

View sample scorecard
Reason #8

High completion rate

Adaface tests are conversational, low-stress, and take just 25-40 mins to complete.

This is why Adaface has the highest test-completion rate (86%), which is more than 2x better than traditional assessments.

test completion rate
Reason #9

Advanced Proctoring


Learn more

About the PostgreSQL Assessment Test

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
Singapore government logo

The hiring managers felt that through the technical questions that they asked during the panel interviews, they were able to tell which candidates had better scores, and differentiated with those who did not score as well. They are highly satisfied with the quality of candidates shortlisted with the Adaface screening.


85%
reduction in screening time

PostgreSQL Hiring Test FAQs

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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