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A Guide to the Entity Relationship Diagram (ERD)

Learn all about Entity Relationship Diagrams (ERDs), what they are used for, how to understand them, how to create them, and more in this guide. What is an Entity Relationship Diagram (ERD)? An Entity...

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SQL Select Statement

In this article, we’ll look at one of the statements you’ll use a lot in SQL: the SELECT statement. What is the SELECT Statement? The SELECT statement in SQL is used to retrieve rows from a database...

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SQL Temp Tables: The Ultimate Guide

Have you ever heard of an SQL temp table or a temporary table? Wondering what it is? Learn all about them in this guide. What is an SQL Temp Table? A temp table or temporary table in SQL is a table...

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SQL Boolean Data Type

Do you need to store a boolean value in your SQL database? Does the data type even exist? Read this article and find out. What is a Boolean? A boolean is a data type that can store either a True or...

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OGB Appreciation Day: A New Version of Oracle Express

For 2019, I am thankful for Oracle releasing the latest version of Oracle Express. I use Oracle Express a lot. I use it to write and run code for articles on this website, to test different features,...

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Sample Database: Movies (ERD and SQL)

When you’re learning SQL or database design, it’s helpful to use other databases as a reference. Many articles online refer to Oracle’s HR database, or SQL Server’s AdventureWorks database. These can...

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How to Resolve Oracle Connection Issues

One of the hardest parts about learning Oracle SQL is getting the database connection working. After you download Oracle (either Oracle Express or the full database), and an IDE of your choice (such as...

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Sample Database: Video Games (ERD and SQL)

When you’re learning SQL or database design, it’s helpful to use other databases as a reference. Many articles online refer to Oracle’s HR database, or SQL Server’s AdventureWorks database. These can...

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Sample Database: Olympic Games (ERD and SQL)

When you’re learning SQL or database design, it’s helpful to use other databases as a reference. Many articles online refer to Oracle’s HR database, or SQL Server’s AdventureWorks database. These can...

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19 Best Database Books

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Sample Database: Superheroes (ERD and SQL)

Do you want to practice SQL on something other than the basic default database? Here’s a sample ERD and data for a superhero database. When you’re learning SQL or database design, it’s helpful to use...

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Sample Database: University Rankings (ERD and SQL)

Do you want to practice SQL on something other than the basic default database? Here’s a sample ERD and data for a university ranking database. When you’re learning SQL or database design, it’s helpful...

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A Guide to SQL NULL (and SQL NOT NULL)

The concept of NULL is something you should know about when working with databases. In this article, you’ll learn all about NULL: what it is, why it’s different, how you can check for it in different...

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Why Use PostgreSQL?

PostgreSQL is a free and open-source database management system. It’s commonly referred to as an alternative to MySQL or MariaDB. Are you thinking about using PostgreSQL for your own project? Or are...

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SQL DROP TABLE: The Complete Guide

How can you delete a table in SQL? Learn how to do this by using the SQL DROP TABLE statement in this article. This article applies to Oracle, SQL Server, MySQL, and PostgreSQL. Table of Contents How...

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Ultimate Guide to Data Warehouses

Data warehouses are an important part of a business. As a developer, you’ll be involved in the data warehouse in one way or another: creating it, designing it, accessing it, or working on software that...

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SQL ALTER TABLE: A Complete Guide

The Oracle ALTER TABLE statement allows you to make changes to an existing table. Learn how to use it and see some examples in this guide. This article applies to Oracle, SQL Server, MySQL, and...

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PostgreSQL vs MySQL: An Analysis

Are you considering using either MySQL or PostgreSQL for your next project? Read this article to find out the differences between these two databases and help decide which one to use. PostgreSQL vs...

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42 ETL Tools: The Definitive List

Are you looking for an ETL or data integration tool? Look no further. This list has all of the currently available ETL tools. Use this for your research to help you decide which tool to use. This list...

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SQL Comments: A How-To Guide

Many programming languages allow you to comment out code so that it does not run. SQL allows comments as well. Learn how to add SQL comments in this article. What is an SQL Comment? A comment in SQL is...

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