SQL Group By: An Explanation and How To Use It скачать в хорошем качестве

SQL Group By: An Explanation and How To Use It

📝 Get my free SQL Cheat Sheets: https://databasestar.mykajabi.com/lpk... 🎓 Master SQL Fundamentals: https://databasestar.mykajabi.com/sql... The SQL GROUP BY keyword is a powerful feature that lets you summarise data from your query into groups. This can be helpful to see the number of employees in a department, or the total value of sales per month, and much more. Any time you need "something PER something else", it's often done with an SQL Group By. In this video, you'll learn what Group By is, a step-by-step process on how to write one, what happens if you don't include Group By, and some examples. Timestamps: 00:00 Start 00:09 What is Group By? 00:30 Sample table 00:49 First query 01:34 Group By question 01:46 Start a Group By query 02:37 Add an Order By 03:04 Can we exclude Group By? 03:59 Using another aggregate function