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25 Aug 2023
SQL for Data Analysis Cheat Sheet
Welcome to our SQL for Data Analysis Cheat Sheet — a must-have resource for anyone looking to harness the power of SQL in the realm of data analysis. Whether you're a data enthusiast, a business analyst, or a seasoned data professional, this cheat sheet is designed to empower you to extract valuable insights from your datasets. Inside, you'll find a carefully curated collection of SQL commands and tips that will elevate your data analysis game.
24 Aug 2023
Boost Your SQL Learning Efficiency With Our New Notebook Feature
You want to learn SQL effectively but you keep forgetting queries? Now you can use LearnSQL.com’s new notebook feature in all our courses! This new tool will help you memorize and recall content. I remember when I first started to learn SQL. I was moving quite smoothly through most of the lessons, taking a lot of notes in my paper notebook. (I have a lot of old school paper notebooks).
22 Aug 2023
How to Prepare for an Advanced SQL Interview
Tips and tricks to help you ace even the most advanced SQL interview questions. SQL has become the lingua franca of data – the standard method for interacting with databases, extracting insights, and conducting analytical tasks. As a data analyst, the ability to understand and manipulate SQL code is not just a 'nice to have'; it's an absolute necessity. For many data analyst roles, a basic understanding of SQL isn't enough.
17 Aug 2023
20 Basic SQL Query Examples for Beginners: A Complete Overview
These 20 basic queries are a must in a starter pack for every SQL beginner. These examples will get you going on your journey to mastering SQL. You’ve set your mind on learning SQL, googled ‘basic sql query examples’ or something similar, and here you are staring at this article. Now what? All learning starts with the basics, so let’s start with the most basic question: What Is SQL?
15 Aug 2023
Data-Driven Career Choices: Database Student
Choosing a career is one of the most important decisions you'll ever make. A data-driven career is one of the best ways to secure your future; today's trend is to store and make use of more and more data in every field. In this article, I'll look at some of the choices available. We're living in an era where the quality and quantity of data is expanding exponentially. In almost any career you choose, you'll need to leverage data to make effective decisions.
10 Aug 2023
Advanced SQL Practice: 10 SQL Practice Exercises with Solutions
As SQL proficiency continues to be in high demand for data professionals and developers alike, the importance of hands-on practice cannot be emphasized enough. Read on to delve into the world of advanced SQL and engage in practical exercises to enhance your skills. This article provides you with a collection of ten challenging SQL practice exercises specifically for those seeking to enhance their advanced SQL skills. The exercises cover a selection of SQL concepts and will help you refresh your advanced SQL knowledge.
8 Aug 2023
What Does GROUP BY 1 and GROUP BY 1, 2, 3 Mean in SQL?
Have you ever come across the unfamiliar GROUP BY 1 syntax in SQL queries and wondered what it's all about? Well, you're not alone! In this article, we'll dive into this syntax, explain its purpose, and make it easier to understand. Whether you are a regular SQL user or you’re just beginning to learn this language, you have probably worked with GROUP BY before. The GROUP BY clause in SQL is used to group rows from a table based on one or more columns.
3 Aug 2023
Best SQL Books for Data Analysis
In the world of data analysis, SQL is a powerful tool. It's a language that helps professionals find, organize, and analyze the data stored in databases. If you're looking to learn this important skill, you've come to the right place. This article will guide you through the best SQL books for data analysis, whether you're just starting out or already have some experience. SQL (Structured Query Language) is a standard language used for working with databases.
1 Aug 2023
Free Course of the Month – Window Functions Practice Set
Do you want to enhance your SQL skills and learn how to prepare complex SQL reports? Maybe you've learned SQL window functions but need a refresher. This month, our unique SQL course Window Functions Practice Set is completely free! You're probably wondering ‘What's the catch?’. Why do we give something for free to our users? Well... we want to support people like you who are constantly striving to be better.
1 Aug 2023
Ignacio L. Bisso
What Is a CTE in T-SQL? An In-Depth Beginner’s Guide with 7 Examples
A common table expression (CTE) is a powerful T-SQL feature that simplifies query creation in SQL Server. CTEs work as virtual tables (with records and columns) that are created on the fly during the execution of a query. They are consumed by the query and destroyed after the query executes. In some cases – like when the query expects data in a specific format and the source tables have the data in another format – a CTE can act as a bridge to transform the data in the source tables to the format expected by the query.