An Introduction to Queries in MySQL

Introduction

Databases are a key component of many websites and applications, and are at the core of how data is stored and exchanged across the internet. One of the most important aspects of database management is the practice of retrieving data from a database, whether it’s on an ad hoc basis or part of a process that’s been coded into an application. There are several ways to retrieve information from a database, but one of the most commonly-used methods is performed through submitting queries through the command line.

In relational database management systems, a query is any command used to retrieve data from a table. In Structured Query Language (SQL), queries are almost always made using the SELECT statement.

In this guide, we will discuss the basic syntax of SQL queries as well as some of the more commonly-employed functions and operators. We will also practice making SQL queries using some sample data in a MySQL database.

MySQL is an open-source relational database management system. One of the most widely-deployed SQL-databases, MySQL prioritizes speed, reliability, and usability. It generally follows the ANSI SQL standard, although there are a few cases where MySQL performs operations differently than the recognized standard.