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  Today, we’re going to understand how to use aggregrate fucntions in Sql. An aggregate function is a function that performs a calculation on a set of values, and returns a single value. Aggregate functions are often used with the  GROUP BY  clause of the  SELECT  statement. The  GROUP BY  clause splits the result-set into groups of values and the aggregate function can be used to return a single value for each group. The most commonly used SQL aggregate functions are: MIN()  - returns the smallest value within the selected column MAX()  - returns the largest value within the selected column COUNT()  - returns the number of rows in a set SUM()  - returns the total sum of a numerical column AVG()  - returns the average value of a numerical column Aggregate functions ignore null values (except for  COUNT(*) ). We will go through the aggregate functions above in the next chapters. The SQL MIN() and MAX() Functions The  M...

On this blog I’ve uploaded all the practical implementations from our previous posts. I used HeidiSQL as the interface to run and visualize queries — don’t be surprised: everything runs on MySQL; HeidiSQL simply connects to MySQL and makes it easier to view results. If you want to try it yourself, download HeidiSQL from your browser and connect using your MySQL credentials (root or another user). Enjoy the video and practice along — you learn by doing, not just by watching.

  In the previous blog, we explored what SQL is and why it’s such an essential part of every application. We also understood how SQL connects with different programming languages and frameworks to manage data effectively. Today, let’s dive a bit deeper and begin our actual SQL journey. We’ll start by learning about databases , tables , and some basic SQL commands that form the foundation of everything we do in SQL. 🏗️ What is a Database? A database is like the main storage base that holds all our data in an organized way. Think of it as a big container where all your information is stored safely. Inside a database, data isn’t just scattered around — it’s neatly arranged in the form of tables . Each database can have multiple tables, and each table stores data related to a specific topic or entity — like customers, employees, products, or orders. 🧩 SQL Data Types When we create tables in SQL, every column needs to store a specific kind of data — numbers, text, dates, or even ...

 🧠 What is a Database? How many of you have come across the word database ? I’m sure almost everyone has heard it at least once! But what exactly is a database? Let’s understand it with a simple example. Think about the lunch boxes we carry to school or college every day — they store our food safely until we need it. In the same way, a database is like a storage box for data. It safely stores and organizes all the information a system needs, so that it can be used whenever required. A database is nothing but a place to store things — just like our brain. Think about it: we remember moments from our childhood and sometimes smile when we recall them. That’s because our brain stores those memories. Similarly, a database acts as the memory of a computer system , storing data so it can be recalled and used whenever needed. 🗂️ Types of Databases Just like everything else in the tech world, databases also come in different types. The two main ones are SQL and NoSQL databases. Now...

 Welcome to the SQL Blog Series! Over the next 10 days, we’ll explore SQL step by step, from the basics to advanced concepts. Below is the complete syllabus of what we’ll be covering.