SQL Resources

How to Use the SQL IN Operator

You can retrieve records whose values are equal to one of multiple possible values from a database using OR conditions. The trouble with this approach is that if you’re looking to compare a column to a long list of values,…

SQL Constraints: A Beginner’s Guide

One of the great features of databases is that they can restrict the types of values stored in a particular column. This means that you don’t need to validate every value before you try to insert it into a database.…

SQL OR and SQL AND Statements

SQL WHERE statements select records from a table based on a particular condition. You don’t have to limit your WHERE statement to just one condition. You can specify as many conditions as you want. That’s where the SQL OR and…

How to Use the SQL INSERT Statement

Have you ever wondered how data is added to a database? Behind every record in a database is an INSERT INTO statement. Without this statement, databases could not store data! In this guide, we’re going to talk about what the…

What are Primary Keys and Foreign Keys?

When you’re storing data in a database, you need to have some way to identify each record that you are storing. Otherwise, it would be impossible to retrieve exactly the right record if it shared the same values as other…

SQL vs. NoSQL: Two Database Architectures Compared

If you’ve spent any time researching database architectures, you may have encountered the terms “SQL” and “NoSQL” and wondered what’s the difference between these two tools. It’s a great question, and one that many people new to databases often have.…

MySQL vs SQL Server: A Side-by-Side Look

Data makes the business world go ‘round, and managing that data takes dedicated frontend and backend systems. Relational database management systems such as MySQL and SQL Server ensure that developers can access and update data efficiently and without issue. To…

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