A composite key is a combination of two or more columns in a database table that together uniquely identify a row, ensuring data integrity when no single column can serve this purpose alone. It is essential in relational databases where complex relationships between tables require unique identification through multiple attributes.

Composite Key

composite key

combination of two or more columns

A database table is like a big grid that helps computers remember lots of information, just like how we use a notebook to remember things. Each part of the grid has a special place for different kinds of information, like names or numbers, so it’s easy to find what we need later.

database table

uniquely identify a row

Data integrity refers to the accuracy, consistency, and reliability of data throughout its lifecycle, ensuring that it remains unaltered and trustworthy for decision-making and analysis. It is crucial for maintaining the credibility of databases and information systems, and involves various practices and technologies to prevent unauthorized access or corruption.

data integrity

single column

Relational databases are structured systems that store data in tables with rows and columns, using a schema to define relationships between different data entities. They enable efficient data retrieval and manipulation through SQL queries, ensuring data integrity and consistency using ACID properties.

relational databases

complex relationships between tables

Unique identification refers to the process of assigning a distinct identifier to an entity to ensure its singularity within a given context, facilitating accurate recognition and differentiation. This is crucial in various fields such as data management, security, and inventory control, where precise tracking and management of entities are essential.

Relevant Degrees

Your Lessons