Difference between SQL and NoSQL?

• SQL Databases:

  • Structured Data: SQL databases use a structured data model. Data is stored in tables with rows and columns, where each column represents a data attribute and each row represents a record.
  • Schema: They have a predefined schema, meaning the structure of the data (tables, columns, data types) must be defined before data can be inserted. Changes to the schema often require a migration process.

• NoSQL Databases:

  • Flexible Data Models: NoSQL databases offer various data models, including key-value pairs, document-oriented, column-family, and graph-based. This allows for more flexibility in how data is stored and retrieved.
  • Schema-less: They are typically schema-less or have a dynamic schema, which means data can be stored without a predefined structure. This makes it easier to handle unstructured or semi-structured data.