Relational vs Non Relational Database

NumPy

Pandas

Data Visualization

MySQL notes —> MySQL

A database is an organized collection of structured information, or data, typically stored electronically in a computer system.

A database is usually controlled by a database management system (DBMS). Database Management Systems (DBMS) are software systems used to store, retrieve, and run queries on data.

• A DBMS serves as an interface between an end-user and a database, allowing users to create, read, update, and delete data in the database.
• Together, the data and the DBMS, along with the applications that are associated with them, are referred database system.

Hard disks are formatted in a well-defined order to store data efficiently. A hard disk plate has many concentric circles on it, called tracks. Every track is further divided into sectors. A sector on a hard disk typically stores 512 bytes of data.