The biggest decision while selecting a database is to where select a relational (SQL) or non-relational (NoSQL) data structure. While the databases are viable options, they still possess certain key differences that users must keep in mind when arriving at a decision.
Relational database management system (RDBMS)
This database contains fixed/static/predefined schema
They are not suited for hierarchical data storage.
They are best suited for complex queries
Follows ACID property
Non-relational or distributed database system.
This database has a dynamic schema
They are best suited for hierarchical data storage.
They are not suitable for complex queries
Follows CAP (Consistency, Availability, & Partition tolerance)
SQL vs NoSQL: Which database is better to use?
As both of the databases have their advantages as well as disadvantages, choosing between SQL and NoSQL depends entirely on individual circumstances. SQL databases are long-established with a fixed schema design and structure. They are perfect for applications that demand multi-row transactions like accounting systems or legacy systems that are developed for a relational structure.
Since NoSQL doesn't have a rigid schema they are quite flexible, Simple to use and most importantly, easily scalable. Applications like CMS, Real-time Analytics and big data applications which have no specific schema definitions are ideal for NoSQL.