PHP MySQL tutorial will explain you What is MySQL and what is Query? with Examples. MySQL is a popular open source database management system that is commonly used in PHP-based web applications.
What is MySql?
MySQL is a database system used on the web. Basically, a MySQL database allows you to create a relational database structure on a web-server somewhere in order to store data or automate procedures.
PHP acts as your queries (among other things), and your forms are basically web pages with fields in them. With all of this combined, you can create truly spectacular projects on the web. If you think of it in comparison to Microsoft Access, MySQL is what holds all of your data in database objects called tables.
A table is a set of values that is organized using a model of vertical columns and horizontal rows. A table consists of records, and each record is made up of a number of fields.
Example of Database table:
What is Query?
A database query is a piece of code (a query) that is sent to a database in order to get information back from the database. Query is used as the way of retrieving the information from database.
A database “query” is basically a “question” that you ask the database. The result of the query is the information that is returned by the database management system.
Queries are usually constructed using SQL (structured query language) which resembles a high-level programming language.
Suppose we had a table called “employees” with the following data:
Simple query for select:
SELECT first_name FROM employees;
Result of above query will be: