What are RDBMS, NoSQL and SQL databases

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Databases are important to businesses because they store information that is essential to the operation of the company, such as customer information, inventory records, and purchase orders. This type of information can be accessed quickly and accurately without having to sort through stacks of paper records or try to remember where each piece of data is stored.

A relational database management system (RDBMS) is a type of database that is used to store, retrieve, and manage data in tables. It stores data in rows and columns.

NoSQL databases are designed to solve problems that DBMSs cannot, such as teacher database unauthorized a storing unstructured data, distributed storage, scalability, and performance.

SQL databases are faster than NoSQL databases, but they are inherently non-scalable. They do not support unstructured data well, making them unsuitable for big data analytics.

How does a database work?
A relational database stores data in tables. Tables are made up of rows and columns. A row is a single record in a table, and a column is a specific field in each row.

A columnar database stores data in columns, which represent specific fields in each row. The columns are stored in sorted order to make them easier to query.

Key-value stores store data either as key-value pairs or as key-value lists. This means that all data is stored as objects, and no tables or rows are needed to organize it.