Working with Subqueries in SQL from Coursera

Welcome to this project-based course, Working with Subqueries in SQL. In this project, you will learn how to use SQL subqueries extensively to query tables in a database.

By the end of this 2-and-a-half-hour-long project, you will be able to use subqueries in the WHERE clause, FROM clause, and the SELECT clause to retrieve the desired result from a database. In this project, we will move systematically by first introducing the use of subqueries in the WHERE clause. Then, we will use subqueries in the FROM and SELECT clause by writing slightly complex queries for real-life applications. Be assured that you will get your hands really dirty in this project because you will get to work on a lot of exercises to reinforce your knowledge of the concept.

Also, for this hands-on project, we will use PostgreSQL as our preferred database management system (DBMS). Therefore, to complete this project, it is required that you have prior experience with using PostgreSQL. Similarly, this project is an advanced SQL concept; so, a good foundation for writing SQL queries is vital to complete this project.

If you are not familiar with writing queries in SQL and want to learn these concepts, start with my previous guided projects titled “Querying Databases using SQL SELECT statement," and “Mastering SQL Joins.” I taught these guided projects using PostgreSQL. So, taking these projects will give the needed requisite to complete this Working with Subqueries in SQL project. However, if you are comfortable writing queries in PostgreSQL, please join me on this wonderful ride! Let’s get our hands dirty!

What's inside

Syllabus

Project Overview

Welcome to this project-based course, Working with Subqueries in SQL. In this project, you will learn how to use SQL subqueries extensively to query tables in a database. By the end of this 2-and-a-half-hour-long project, you will be able to use subqueries in the WHERE clause, FROM clause, and the SELECT clause to retrieve the desired result from a database. In this project, we will move systematically by first introducing the use of subqueries in the WHERE clause. Then, we will use subqueries in the FROM and SELECT clause by writing slightly complex queries for real-life applications. Be assured that you will get your hands really dirty in this project because you will get to work on a lot of exercises to reinforce your knowledge of the concept. Also, for this hands-on project, we will use PostgreSQL as our preferred database management system (DBMS). Therefore, to complete this project, it is required that you have prior experience with using PostgreSQL. Similarly, this project is an advanced SQL concept; so, a good foundation for writing SQL queries is vital to complete this project. If you are not familiar with writing queries in SQL and want to learn these concepts, start with my previous guided projects titled “Querying Databases using SQL SELECT statement," and “Mastering SQL Joins.” I taught these guided projects using PostgreSQL. So, taking these projects will give the needed requisite to complete this Working with Subqueries in SQL project. However, if you are comfortable writing queries in PostgreSQL, please join me on this wonderful ride! Let’s get our hands dirty!

Good to know

Know what's good

, what to watch for

, and possible dealbreakers

Emphasizes extensive use of SQL subqueries for complex database queries, enhancing data manipulation capabilities

Taught by Arimoro Olayinka Imisioluwa, providing learners with access to expertise in SQL subqueries

Employs PostgreSQL as the preferred DBMS, assuming prior experience with the platform, which may limit accessibility for beginners

Focuses on real-life applications, ensuring relevance to practical database management scenarios

Assumes a good foundation in writing SQL queries, excluding those new to the concept

Offers hands-on exercises to reinforce understanding, promoting active learning

Reviews summary

Sufficient sql subquery practice

According to students, this course provides enough practice in writing SQL subqueries and is useful for learners who already have basic SQL skills. While students largely appreciate the number of exercises, some learners criticize the overly complex examples. Variety of exercises and engaging assignments help beginners learn how to write subqueries in increasing complexity. However, learners should note that the certificate exam for this course includes questions that do not assess SQL subquery knowledge.

Provides varied and engaging exercises

"Great instructor! The exercises moved with increasing complexity and the lessons were engaging."

"The practice was nice, but the examples given were kind of over-complicated."

Exam includes non-subquery questions

"The end-of-course exam had a few useless questions and did not assess SQL subquery knowledge."

Examples can be overly complex

"made unnecessarily complicated , it could been much easier "

"The practice was nice, but the examples given were kind of over-complicated."

Activities

Be better prepared before your course. Deepen your understanding during and after it. Supplement your coursework and achieve mastery of the topics covered in Working with Subqueries in SQL with these activities:

Subquery Practice Exercises

Show steps

Strengthen your subquery writing skills through repetitive exercises.

Show steps

Find online platforms or textbooks that offer subquery practice problems.
Solve the exercises, paying attention to syntax and logic.
Review your answers and identify areas for improvement.

Create a Subquery Cheat Sheet

Show steps

Solidify your understanding of subqueries by creating a comprehensive reference guide.

Show steps

Gather examples of subqueries from the course and other resources.
Categorize and organize the subqueries based on their usage.
Create a visual or written guide that summarizes the different types and syntaxes of subqueries.

Subquery Discussion Group

Show steps

Engage with fellow learners and discuss subqueries to enhance understanding and troubleshoot challenges.

Show steps

Form a study group or join an online forum dedicated to SQL subqueries.
Share your knowledge and experiences with subqueries.
Collaborate on solving subquery-related problems.

Three other activities

Expand to see all activities and additional details

Show all six activities

Practice Using PostgreSQL Subqueries

Show steps

Enhance your understanding of subqueries and reinforce your PostgreSQL skills through hands-on practice.

Show steps

Find online tutorials covering PostgreSQL subqueries.
Follow the tutorials, experimenting with different subquery types and scenarios.
Attempt exercises and challenges provided in the tutorials.

Attend a SQL Subqueries Workshop

Show steps

Deepen your understanding and practical skills in using subqueries by attending a dedicated workshop.

Show steps

Identify and register for relevant workshops offered by universities, tech companies, or training providers.
Actively participate in the workshop, taking notes and asking questions.
Apply the knowledge and techniques learned in the workshop to your own projects or assignments.

Build a Subquery-Based Data Analysis Tool

Show steps

Put your subquery skills to the test by creating a tool that leverages subqueries for complex data analysis.

Show steps

Define the scope and requirements of your data analysis tool.
Design the database schema and tables that will be used for the analysis.
Develop SQL queries incorporating subqueries to extract and process the desired data.
Create a user interface or API to interact with the tool and perform data analysis.
Test and refine your tool to ensure accuracy and efficiency.

Career center

Learners who complete Working with Subqueries in SQL will develop knowledge and skills that may be useful to these careers:

Data Engineer

A Data Engineer designs, builds, and maintains data pipelines and data systems. As a Data Engineer, you will need to be able to extract, transform, and load data from various sources, and ensure that data is clean, consistent, and reliable. The Working with Subqueries in SQL course can be useful in this role by providing you with the skills and knowledge needed to effectively query and manage data, and design and implement data pipelines.

See salaries and explore the career path for Data Engineer

Database Architect

A Database Architect designs and implements database systems. As a Database Architect, you will need to be able to analyze and design database systems, and ensure that they are efficient, scalable, and secure. The Working with Subqueries in SQL course can be useful in this role by providing you with the skills and knowledge needed to effectively query and manage databases, and design and implement database systems.

See salaries and explore the career path for Database Architect

Data Scientist

A Data Scientist uses data to build predictive models and solve business problems. As a Data Scientist, you will need to be able to collect, analyze, and interpret data, and use it to develop models that can be used to make predictions and decisions. The Working with Subqueries in SQL course can be useful in this role by providing you with the skills and knowledge needed to effectively query and analyze data, and build predictive models.

See salaries and explore the career path for Data Scientist

Operations Research Analyst

An Operations Research Analyst uses mathematical and analytical methods to solve business problems. As an Operations Research Analyst, you will need to be able to collect and analyze data, and use it to develop models and solutions to business problems. The Working with Subqueries in SQL course can be useful in this role by providing you with the skills and knowledge needed to effectively query and analyze data, and develop models and solutions to business problems.

See salaries and explore the career path for Operations Research Analyst

Actuary

An Actuary uses mathematical and statistical methods to assess risk and uncertainty. As an Actuary, you will need to be able to collect and analyze data, and use it to develop models and solutions to assess risk and uncertainty. The Working with Subqueries in SQL course can be useful in this role by providing you with the skills and knowledge needed to effectively query and analyze data, and develop models and solutions to assess risk and uncertainty.

See salaries and explore the career path for Actuary

Data Analyst

A Data Analyst collects, analyzes, interprets, and presents data to help organizations make informed decisions. As a Data Analyst, you will need to be able to extract and analyze data from various sources, and use it to identify trends, patterns, and insights. The Working with Subqueries in SQL course can be useful in this role by providing you with the skills and knowledge needed to effectively query and analyze data, and generate meaningful insights.

See salaries and explore the career path for Data Analyst

Epidemiologist

An Epidemiologist investigates the causes and distribution of disease in populations. As an Epidemiologist, you will need to be able to collect and analyze data, and use it to develop models and solutions to prevent and control disease. The Working with Subqueries in SQL course can be useful in this role by providing you with the skills and knowledge needed to effectively query and analyze data, and develop models and solutions to prevent and control disease.

See salaries and explore the career path for Epidemiologist

Statistician

A Statistician collects, analyzes, and interprets data to help organizations make informed decisions. As a Statistician, you will need to be able to design and conduct statistical studies, and use statistical methods to analyze data and draw conclusions. The Working with Subqueries in SQL course can be useful in this role by providing you with the skills and knowledge needed to effectively query and analyze data, and perform statistical analysis.

See salaries and explore the career path for Statistician

Biostatistician

A Biostatistician uses statistical methods to analyze biological and medical data. As a Biostatistician, you will need to be able to collect and analyze data, and use it to develop models and solutions to biological and medical problems. The Working with Subqueries in SQL course can be useful in this role by providing you with the skills and knowledge needed to effectively query and analyze biological and medical data, and develop models and solutions to biological and medical problems.

See salaries and explore the career path for Biostatistician

Data Visualization Analyst

A Data Visualization Analyst designs and creates data visualizations to communicate data insights to stakeholders. As a Data Visualization Analyst, you will need to be able to collect and analyze data, and use it to create visualizations that are clear, concise, and informative. The Working with Subqueries in SQL course can be useful in this role by providing you with the skills and knowledge needed to effectively query and analyze data, and create data visualizations.

See salaries and explore the career path for Data Visualization Analyst

Business Analyst

A Business Analyst analyzes business processes and systems to identify areas for improvement. As a Business Analyst, you will need to be able to collect and analyze data, and use it to identify opportunities for improvement and develop solutions to problems. The Working with Subqueries in SQL course can be useful in this role by providing you with the skills and knowledge needed to effectively query and analyze data, and identify opportunities for improvement.

See salaries and explore the career path for Business Analyst

Software Engineer

A Software Engineer designs, develops, and maintains software applications. As a Software Engineer, you will need to be able to write and understand code, and design and implement software systems. The Working with Subqueries in SQL course can be useful in this role by providing you with the skills and knowledge needed to effectively query and manage data, and design and implement software systems that interact with databases.

See salaries and explore the career path for Software Engineer

Financial Analyst

A Financial Analyst analyzes financial data to make investment recommendations and decisions. As a Financial Analyst, you will need to be able to collect and analyze data, and use it to develop insights into financial markets and make investment recommendations. The Working with Subqueries in SQL course can be useful in this role by providing you with the skills and knowledge needed to effectively query and analyze financial data, and make investment recommendations.

See salaries and explore the career path for Financial Analyst

Market Researcher

A Market Researcher conducts research to understand consumer behavior and market trends. As a Market Researcher, you will need to be able to collect and analyze data, and use it to develop insights into consumer behavior and market trends. The Working with Subqueries in SQL course can be useful in this role by providing you with the skills and knowledge needed to effectively query and analyze data, and develop insights into consumer behavior and market trends.

See salaries and explore the career path for Market Researcher

Database Administrator

A Database Administrator designs, builds, maintains, and repairs databases and database systems. As a Database Administrator, you will need to analyze and diagnose performance issues, and implement solutions to improve system performance and stability. You will also monitor and troubleshoot databases regularly to ensure that they are running efficiently, and that data is secure and protected. The Working with Subqueries in SQL course can be useful in this role by providing you with the skills and knowledge needed to effectively query and manage databases, ensuring optimal performance and data integrity.

See salaries and explore the career path for Database Administrator