Database

A database is an organized collection of data, generally stored and accessed electronically from a computer system. According to this definition, our file-based implementation is also a database.

Types of Databases

Query Language

A query language is a domain specific language used to make queries in databases and information systems (In this context context is a database). Complex queries can be expressed in a query language. There are many types of query languages.

SQL

SQL is the standard language for relational database management systems. SQL statements are used to perform tasks such as update data on a database, or retrieve data from a database.

In SQL, data is stored in tables. A table is a collection of related data entries and it consists of columns and rows.

SQL Injection Attack

SQL injection is a malicious technique in computer engineering where an attacker manipulates input data to insert or execute arbitrary SQL query within a web application's database. This vulnerability occurs when user inputs are not properly validated or sanitized, allowing unauthorized access to the database and potentially exposing sensitive data. SQL injection poses a significant security risk, as it can lead to data breaches, unauthorized data manipulation, and even full system compromise if not adequately mitigated. It is not only made by attackers but can occur by mistake by filling forms that runs SQL queries behind.