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.

A Record

A Record: Explanation & Example

The Domain Name System makes it easy for every user to navigate the internet. One of its most important components are A records, which link a domain name to an individual IP address. Only a line of text is needed. But what does this kind of record look like, and how can you perform an A record check?

DNS Records

DNS Records: How Do DNS Records Work?

Without the Domain Name System, the internet as we know it today would be inconceivable. The system for name resolution itself, is based on DNS records. In these simply structured records in normal text files, a name is stored for each IP address. However, DNS records can do more than this. Also known as resource records, various types of them exist.

SOA Record

SOA Records: The Basis of Every Zone File

The Domain Name System enables the use of domain names for surfing and is based on zone files. These in turn are made up of different records. The first DNS entry you encounter in such a data file is always the SOA record. This determines authority within the zone. We explain how the records are designed and how you can perform an SAO record check.

PTR Record

PTR record: How does the DNS record work?

PTR records turn the DNS on its head: Instead of getting from a domain name to the corresponding IP address – as is normally the case – with reverse DNS the opposite occurs. Which domains belong to an IP address? You can acquire this information using PTR records, which are a special type of DNS record. How do the DNS records need to be structured for this?

CNAME Record

CNAME Record: Explanation of the DNS Record Type

The Domain Name System and name resolution enable hassle-free surfing for users on the World Wide Web. Here, the DNS has recourse to several types of resource records. One of these is CNAME. This allows different domains to be linked together with one IP address. But how do CNAME records work and how can you check the records?

Hyper-converged systems: More order in IT?

Hyper-converged systems: The compact data center

The traditional data center could be significantly streamlined by migrating to a hyper-converged system. By eliminating the need for highly complex infrastructures and multiple work areas, the company’s IT department could function more efficiently, dynamically, and cost-effectively. This is made possible using preconfigured standard hardware and a complete virtualization of the IT infrastructure....

Relational Databases

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,...

The most important HTTP status codes at a glance

HTTP status codes and their meaning

404, 302, 503 – short number combinations with great significance. Users encounter server status reports time and time again and if you know how to interpret them you can act accordingly. Knowledge of HTTP codes is even more relevant for website owners. With the right know-how you can vastly improve user experience on your homepage, which will have an effect on the search engine ranking.

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