A database is a place to store and retrieve data from. Static websites don’t need databases because all the needed information for the site is contained within the HTML or PHP pages themselves. But dynamic websites need a database to store the information that can be retrieved to generate the content. Hence to host dynamic websites you will need web hosting databases.
The following are the well known database types :
- MySQL (it’s free and powerful)
- Microsoft SQL (MS SQL) (Powerful and very popular on Windows servers.)
- PostgreSQL (Free but includes a few more advanced features than MySQL)
Other web hosting databases:
- Oracle (Fast, super powerful but expensive)
- Microsoft Access (Convenient but weak)
How does Web Hosting Databases work?
A relational database is a set of data tables. Each of the database tables has different types of fields across the top and each row contains data for a different object. Basically, all tables are linked to each other using a primary and foreign key. However, the database allows multiple site users to store and retrieve data at the same time.
SQL (Structural Query Language) is a standard way for retrieving and modifying data in a database. SQL Query is a command that performs different operations on a database such as Create, Select, Add, delete, Update, Alter etc.
- The following query will retrieve all the data from database table.
SELECT * FROM Clients;
This query will return following output :
- The following query will add the data to database table.
INSERT INTO Clients (name,telephone,email) VALUES (“Joseph”,444-2342,”firstname.lastname@example.org”);)
This query will add the given the record to a database table and the table will have the following contents:
However, there are many more SQL commands used to manage database data. You can check all the commands with examples as well as their detailed explanation here.
Please check our following articles explaining databases differences and similarities:
Hopefully, this article was useful for Developers and Database administrators to understand basic databases and how to use them.