How to use the SQL IFNULL() function to output alternative values

How to use the SQL IFNULL() function to output alternative values

If you come across an empty expression in a table, you can replace it with an alternative value. In our article, we introduce you to the SQL IFNULL() function, specifically designed for this task. We explain the structure of the function in detail and provide practical examples…

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How to set up and query conditions with SQL CASE

How to set up and query conditions with SQL CASE

SQL CASE can be used to query a list of conditions in SQL and display corresponding results. This statement works by checking each condition and returning results based on whether the conditions are met. In this dedicated article, we explain how SQL CASE works and demonstrate its…

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How to use SQL `MIN` and `MAX`REDPIXEL.PLShutterstock

How to use SQL `MIN` and `MAX`

Whether you’re working with sales reports, salary analyses or anomalies and trends, the SQL functions `MIN` and `MAX` are essential tools. The two functions return the smallest and largest values in a column. There are countless uses for the functions, ranging from quick data…

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How to use SQL BACKUP DATABASE to secure your database against data losscybrainshutterstock

How to use SQL BACKUP DATABASE to secure your database against data loss

To ensure the security of your data, it is crucial to create backups of your database regularly. The SQL BACKUP DATABASE statement is the simplest and most effective method for this. We will introduce the syntax of the statement, explain how it works with examples, and show you…

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How to use SQL AVG()

How to use SQL AVG()

The SQL AVG() function is the best tool for calculating the average value of a column. In addition to computing averages, it can be combined with other operations as well. We’ll explain the syntax of SQL AVG() and the different ways it can be used. With a few easy-to-follow…

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How to check and replace NULL values with SQL ISNULL()

How to check and replace NULL values with SQL ISNULL()

SQL ISNULL() is a practical function for checking the value of an expression. If a value is NULL, the function replaces it with a substitute value that you define in advance. In our dedicated article, we explain how this works using practical examples and reveal some of the…

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How to use SQL EXISTS to check subqueries for certain values

How to use SQL EXISTS to check subqueries for certain values

The SQL EXISTS operator allows you to check whether a subquery contains a specific value. You can incorporate this subquery into a higher-level query and use it as a condition for execution. In this dedicated article, you will learn the structure of SQL EXISTS and find out how to…

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What are SQL aliases?ChinnapongShutterstock

What are SQL aliases?

For table or column names that are long or difficult to read, it can help to create a temporary alternative name that’s simpler. SQL aliases do just this, providing simplified column and table names for queries. These aliases are only applied while the query is being carried out…

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How to delete databases permanently with SQL DATABASE

How to delete databases permanently with SQL DATABASE

If you no longer need a database, you should permanently remove it using the SQL DROP DATABASE command. This dedicated guide explains how to use this command to get rid of single or multiple databases, explains what you should keep in mind when doing so, and lists the associated…

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How to use SQL LIKE

How to use SQL LIKE

It’s easy to lose track of things in large datasets. The SQL LIKE operator is an essential tool for searching databases and making efficient queries. In this tutorial, we explain what the SQL LIKE operator is, what it’s used for and how to use SQL wildcards. We also show you…

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