31 May 2022 Dorota Wdzięczna How to Install a MySQL Database on a Windows PC Do you want to install a MySQL database on your Windows computer? And maybe find out how to start using a MySQL database? In this article, we’ll cover the installation process. MySQL is one of the most popular relational database servers. This is one reason to start using a MySQL database. Among the various editions of MySQL delivered by Oracle, the Community edition is available for free. You can download it from the MySQL website. Read more 17 Sep 2021 Dorota Wdzięczna How to Export a CSV File From a T-SQL Query Knowing SQL queries to select data from databases allows you to obtain information easily. However, there are many situations in which we need to export data to another platform or application. The CSV file is a solution to this problem. If you'd like to master complete SQL, try out our interactive SQL from A to Z track. It contains 7 hands-on SQL courses that will take you from a beginner to an advanced SQL user. Read more 31 Aug 2021 Dorota Wdzięczna SQL MIN and MAX Functions Explained in 6 Examples What are the SQL MIN() and MAX() functions? When should you use them as aggregate functions, and when should you use them with window functions? We explain using practical examples. SQL includes several aggregate functions. These aggregate functions compute calculations on numerical data. This article focuses on only two of these functions: MIN() and MAX(). I will explain what each function does and discuss several use cases. If you want to practice SQL aggregate functions, I recommend our interactive SQL Practice Set course. Read more 23 Jul 2021 Dorota Wdzięczna SQL SUM() Function Explained with 5 Practical Examples Aggregate functions are an important part of SQL knowledge – and there’s no better place to start learning them than with the SUM() function. In this article, you can expand or refresh your SQL with 5 practical examples of SUM(). SQL allows us to do more than select values or expressions from tables. Most operations on relational databases use aggregate functions like SUM() to do computations on data. Read more 26 Mar 2021 Dorota Wdzięczna How to Install MS SQL Server 2019 on Windows Do you want to install SQL Server 2019 on your Windows PC? How about the latest version of SQL Server Management Studio? I’ll walk you through the process. Soon you’ll be writing T-SQL queries and operating on SQL Server databases! As I write this article, Microsoft SQL Server 2019 is the latest version of SQL Server. It’s the 15th version of one of the most popular database servers in the world. Read more 23 Dec 2020 Dorota Wdzięczna What Is an SQL INNER JOIN? How do you combine data from different tables in one query? An SQL feature called JOIN is the most common operator used to create complex queries. Learn the basics in this article. SQL allows us to select data from more than one table. In fact, the whole idea of using relational databases is selecting data from related tables. And we can use SQL’s JOIN operator to do this. There are many types of JOINs in SQL. Read more 16 Sep 2020 Dorota Wdzięczna How to Join Two Tables in SQL Querying data from multiple tables is very common when working with relational databases. It is not difficult if you know how to use the dedicated SQL operators for doing this. In this article, you will learn how to join two tables by using WHERE and by using a special operator JOIN, and you will see how to filter rows in the result set. If you want to practice joining tables in SQL, check out our interactive SQL JOINs course. Read more 8 Sep 2020 Dorota Wdzięczna Seven Examples Using MySQL Window Functions Window functions are an advanced SQL feature available in most popular databases. MySQL had not supported them for a long time, but that changed in Version 8.0. They are helpful not only for analysts and people who create reports, but also for other professionals who use databases to select data needed. In this article, we explain the syntax of some popular window functions with practical examples. What Is a Window Function? Read more 19 Aug 2020 Dorota Wdzięczna How to Create a Table in SQL Creating tables in databases is a very helpful skill, and not just for software engineers or database administrators. It allows you to design or change the structure of a database and store data that’s related to each other. In this article, you’ll learn what a database table is, who creates them, and how to use the syntax of the CREATE TABLE command. What Is a Database Table? A relational database is built of various structures like tables, views, procedures, and triggers. Read more 31 Jul 2020 Dorota Wdzięczna The SQL HAVING Clause Explained What is the SQL HAVING clause? Why do you need it, and where do you use it? We’ll explain HAVING in detail. HAVING is a very common clause in SQL queries. Like WHERE, it helps filter data; however, HAVING works in a different way. If you are familiar with the GROUP BY clause and have only heard about HAVING – or if you’re not familiar with HAVING at all – this article is what you need. Read more «« « 1 2 3 4 » »»