What is Chrome 68?

Early next month, Chrome 68 will be launched and the new browser will distrust all webpages that do not have HTTPS encryption as “not secure”. This is...

HTTP 408: how to fix the timeout error

Permanent availability is one of the most important things when it comes to a website. However, even the best technical conditions do not offer a 100% guarantee that a website will constantly run smoothly. Connection errors like HTTP error 408 regularly present websites with minor and major difficulties, especially since the causes are often found on the client side. Our guide looks at the causes...

Databases – why do you need them and what kinds are there?

Databases are a fundamental part of our information society today. They organise electronic data and regulate access to it. Databases have a wide range of applications, both commercial and private. Each database system has a database management system based on a specific database model. Whilst the history of the database began with the hierarchical model, today the relational database model is the...

What is Chrome 68?

Early next month, Chrome 68 will be launched and the new browser will distrust all webpages that do not have HTTPS encryption as “not secure”. This is a big step in the recent trend towards emphasising user safety on the internet, a not entirely selfless strategy from Google. In this guide, we will explain what changes will be made, why they are happening, and how you can prepare your website...

Less redundancy thanks to database normalisation

Redundancies occur when various details are combined in a single database table. These redundancies use up storage capacity and prevent efficient data processing. The relational database model offers strategies for splitting datasets among several linked tables, in a process called database normalisation. Find out what it’s all about with practical examples.

SQL OUTER JOIN

OUTER JOINs are queries that take place across several database tables. There are LEFT OUTER JOINs, RIGHT OUTER JOINs and FULL OUTER JOINs. Each of these JOIN types has a larger result set than the INNER JOIN. But what exactly is the difference between the individual types? Here, we will distinguish OUTER JOINs from INNER JOINs, compare the different subtypes of OUTER JOINs and explain how they...

INNER JOIN: definition and application

The INNER JOIN is the most important JOIN type in the relational database model. If you want to query database tables in a group, you would usually use INNER JOINs based on equality relationships between primary and foreign keys. We will show you how to use INNER JOINs in practice, delineate the JOIN type from OUTER JOINs, and also deal with the different subtypes of INNER JOINs.

SQL JOIN – queries across multiple data tables

A major strength of the relational database model is that information is stored in separate database tables structured according to semantic relationships. This concept, known as normalisation, is the basis for data storage that is as redundancy-free as possible, but requires a mechanism with which data from different tables can be merged for queries. The different JOIN types provide users with...

All you need to know: what is a hostname?

A computer’s unique name on a network is the hostname, site name or computer name. The hostname is part of the fully qualified domain name, which can be used (for example) to find and access websites on the internet. Here you’ll learn what a hostname looks like, and we’ll show you various ways to determine the hostname using an IP address or how to change it.

The relational database model

With relational database systems, you use tables to store and manage information. This sounds simple but involves quite complex concepts such as normal forms, key relationships, and JOINs. This article will introduce the basics of the relational database model, compare its advantages and disadvantages, and delimit this type of data storage from alternative approaches, like object databases,...

Error 522 – 'Connection timed out': How to fix the error

52- HTTP error messages indicate a problem between the web server that is running a website and the Cloudflare CDN service. The 522 error is very common and is also known as the 'Cloudflare error'. It is displayed in the visitor’s browser whenever the mandatory TCP handshake fails. This guide explains the reason for this error message and what solutions there are for site operators and visitors....