Relational databases have been dominating on the database market for a while. Recently they have been disrupted by a rapid growth of NoSQL databases.
Please see the stats data provided in the articles below to get a sense of how this trend has been developing in recent years:
NoSQL databases eat into the relational database market:
https://www.techrepublic.com/article/nosql-databases-eat-into-the-relational-database-market/
NoSQL keeps rising, but relational databases still dominate big data:
NoSQL keeps rising, but relational databases still dominate big data
Vital Things to Consider When Choosing a Database for Your App:
A guide to choosing a reliable and scalable database solution for your product
Most popular databases in 2019 according to Stackoverflow survey:
https://insights.stackoverflow.com/survey/2019
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