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Database for web app: which to choose (PostgreSQL, MySQL, MongoDB)

December 31, 20256 min read
Author: 7kar7son7Developer

Database comparison: relational vs NoSQL, when which database makes sense and how to avoid wrong choice.

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TL;DR

  • database for web application which to choose
  • For developers and businesses building web apps and needing to choose the right database.

Who this is for

  • For developers and businesses building web apps and needing to choose the right database.

Keyword (SEO)

  • database for web application which to choose

Relational vs NoSQL

  • Relational (SQL): structure, transactions, ACID
  • NoSQL: flexibility, horizontal scaling
  • Hybrid: best of both worlds

When PostgreSQL

  • Apps with relations (users, orders)
  • ACID requirements (payments, finance)
  • Complex queries and reports

When MySQL

  • Simple web apps
  • WordPress, Drupal (CMS)
  • Smaller projects with smaller budget

When MongoDB

  • JSON documents (catalogs, blogs)
  • Fast prototypes
  • Large data volumes without structure

FAQ

Can I change database later?

Yes, but requires data migration and code changes. Better choose well from start.

PostgreSQL or MySQL for startup?

PostgreSQL is more advanced with better JSON support. MySQL is simpler with larger community. Both are good.

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About the author

Developer at DevStudio.it. Focused on performance, SEO and production-ready web apps.

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