Beginner SQL Tutorials

SQL math operators are easy to use and very powerful. They can help you to perform advanced analytics and calculations within your queries. We've put together this helpful guide to assist you in learning...

A comment in SQL can be used in a couple of different ways. One usage of SQL comments is to provide documentation about what your code is doing. This is often helpful if you have complicated queries that...

Sometimes when you're working with a SQL database, you need to be able to delete an entire table. There can be a lot of reasons why you would need to do this. This is a fairly easy, beginner SQL skill...

If you're working with a database, you will need to know how to get data from multiple tables in SQL. This is a common task for database developers and analysts, as it allows them to combine data from...

Learning how to insert data into a SQL table is one of the most common tasks for learning to code in SQL . In this article, we will provide a step-by-step guide on how to insert data into a SQL table,...

When summarizing data in SQL, a common question is how to select the latest date in SQL. There are straightforward ways to get the most recent date within a table or subset of data. However, when summarizing...

Are you looking to learn how to use the SELECT DISTINCT statement in SQL? If so, you're in the right place! The SELECT DISTINCT statement is a useful tool in SQL that allows you to filter out duplicate...

Many SQL beginners wonder how to use single quotes in SQL. It is very simple to do, but there are some things to keep in mind. Single quotes are a special character in Structured Query Language...

The SQL MIN function is a useful tool for returning the minimum value within a specific column of a table. It is commonly used in SELECT statements to retrieve the lowest value from a range of values,...

The UNION clause in SQL is a keyword used to combine the results of two or more SELECT statements into a single result set. It allows you to retrieve data from multiple tables or views and combine them...

A particularly confusing aspect of writing queries is querying where NULL in SQL. What does that mean exactly? Null is a special type of operator in SQL. It is essentially the absence of a value....

A Cartesian product is a type of join operation in SQL (Structured Query Language) that combines every row from one table with every row from another table. It is also known as a cross join. This results...

When writing queries to filter and summarize data, it's important for you to know the difference between WHERE and HAVING in SQL. Let's look at the functionality associated with each keyword and compare...

An important thing to know when writing queries is how to get the current date in SQL. Fortunately, this is an easy topic to learn, but it has slight variations across the different types of database...