Interview Questions, Answers and Tutorials

Category: 3. SQL Basics

Writing Your First SQL Query

Welcome to the world of SQL! SQL (Structured Query Language) is a language used to communicate with databases. Imagine a database as a big, organized library full of information. SQL is the tool you use to ask questions and get the exact information you need from that library. In this guide, we will cover: 1. What is SQL? SQL stands for Structured Query Language. It’s the language we use to talk to a database. We can use SQL to: 2. Database Basics A database is like a giant spreadsheet or a big digital filing cabinet. The information in the database…

SQL Syntax Overview

Welcome to the world of SQL (Structured Query Language)! SQL is the language used to communicate with databases. It helps you store, manage, and retrieve data in a structured way. Think of a database like a huge library, and SQL as the librarian that helps you find the books you want. In this post, we’ll go over the basic structure of SQL and how you can write queries to interact with a database. We will explain everything in simple terms, like we’re explaining to a 10-year-old. Key SQL Components Before we dive into SQL syntax, let’s first understand the basic…

Understanding Tables, Rows, and Columns

Imagine you have a big notebook where you keep track of all your favorite toys, video games, and books. This notebook has tables that help you organize everything neatly. Tables are like grids with rows and columns where you can store information. Let’s dive in and understand these in simple terms. 📚 What is a Table? A table in a database is like a spreadsheet. It’s a structured way to organize and store data. For example, if you want to keep track of your toy collection, you can create a table like this: Toy ID Toy Name Type Color 1…