The query doesn't work in MySQL Server because there are PHP variables.
$adshex, $flightno, $route
"INSERT INTO Flights (`adshex`,`flightno`,`route`)
WHERE NOT EXISTS (SELECT flightno FROM Flights
WHERE `flightno` = '$flightno' AND `adshex` = '$**adshex**'
AND TIMESTAMPDIFF(MINUTE,`timestamp`,CURRENT_TIMESTAMP) > 360);
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About the technologies asked in this question
PHP (from the English Hypertext Preprocessor - hypertext preprocessor) is a scripting programming language for developing web applications. Supported by most hosting providers, it is one of the most popular tools for creating dynamic websites.
The PHP scripting language has gained wide popularity due to its processing speed, simplicity, cross-platform, functionality and distribution of source codes under its own license. https://www.php.net/
DBMS is a database management system. It is designed to change, search, add and delete information in the database. There are many DBMSs designed for similar purposes with different features. One of the most popular is MySQL.
It is a software tool designed to work with relational SQL databases. It is easy to learn even for site owners who are not professional programmers or administrators. MySQL DBMS also allows you to export and import data, which is convenient when moving large amounts of information. https://www.mysql.com/
HTML (English "hyper text markup language" - hypertext markup language) is a special markup language that is used to create sites on the Internet.
Browsers understand html perfectly and can interpret it in an understandable way. In general, any page on the site is html-code, which the browser translates into a user-friendly form. By the way, the code of any page is available to everyone. https://www.w3.org/html/
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