SQL Foundations 05: Sorting and Grouping Your Data

Sorting and grouping are essential for making sense of data, especially when dealing with large datasets.

SQL Foundations 05: Sorting and Grouping Your Data

Welcome to Day 5, the final day of our SQL journey at SkillSprints! Today, we're going to learn about sorting and grouping data, key techniques in organizing and summarizing your SQL queries.

Understanding ORDER BY and GROUP BY Sorting and grouping are essential for making sense of data, especially when dealing with large datasets.

Step 1: Sorting Data with ORDER BY The ORDER BY clause is used to sort data in ascending or descending order.

  1. Open phpMyAdmin: Access your SQL environment.
  2. Select Database and Table: Choose sql_sprint and then employees.
  3. SQL Query with ORDER BY: Try sorting employees by their salary in descending order: SELECT * FROM employees ORDER BY salary DESC;
  4. Run the Query: See how the employees are now ordered from the highest to the lowest salary.
Ordered by salary from most to lease (Command line image)

Step 2: Grouping Data with GROUP BY GROUP BY is used to group rows that have the same values in specified columns, often used with aggregate functions.

SELECT department, COUNT(*) as employee_count FROM employees GROUP BY department;

Data is grouped and summarized in this command line screenshot

This query shows the number of employees in each department.

Step 3: Combining GROUP BY with ORDER BY You can combine these to group data and then sort the groups.

SELECT department, AVG(salary) as average_salary FROM employees GROUP BY department ORDER BY average_salary DESC;

Data is grouped with a calculated result

Closing Thoughts and Encountered a Hitch? As we wrap up our course, remember that sorting and grouping are powerful tools for analyzing data. If you have any questions or run into difficulties, our Slack channel is here for support!

Your Mission: Practice using ORDER BY and GROUP BY in your queries. Experiment with different columns and see what insights you can gather from the employees database.

Congratulations! You’ve made it through the SkillSprints SQL Foundations course! You’ve gained valuable skills that are essential in the world of data. Keep practicing and exploring, and you'll continue to grow as an SQL expert!

Need more help or have feedback? Let’s chat on Slack!

Happy Querying, and here's to your continued SQL journey!