SQL Server, MySQL, PostgreSQL, Oracle, SQLite, MongoDB: there are many good database systems, but they are good for different situations.
This guide helps you choose a database based on the application you are building, where it will run, who will maintain it, what it will cost, and what features you actually need.
Database selection scorecard
General guidance, not a benchmark. The right choice still depends on your project and team.
There is no single database winner for every type of application.
DB-Engines ranked 434 database systems in June 2026. The top four were Oracle, MySQL, Microsoft SQL Server, and PostgreSQL, with MongoDB in fifth place. That ranking is based on popularity signals, not exact market share, but it is useful for seeing which systems have broad adoption and staying power.
Developer surveys show a different angle. In Stack Overflow's 2025 Developer Survey, PostgreSQL ranked highest among databases developers wanted to use next year, and also highest among databases developers had used and wanted to continue using.
The web hosting world tells another story. WordPress is used by 41.5% of all websites and has 59.2% of the CMS market, according to W3Techs. WordPress uses MySQL-compatible databases such as MySQL and MariaDB, which helps explain why MySQL-compatible hosting is still so common. See the WordPress hosting handbook.
The practical lesson: do not choose a database only because it is popular. Choose it because it fits the application you are building.
These questions usually matter more than feature checklists.
A public website, internal business app, customer portal, reporting dashboard, and mobile companion app can all have different database needs. Start with the application type before choosing the technology.
An in-house application may naturally point to SQL Server or Oracle. A standard web-hosted application may point to MySQL/MariaDB or PostgreSQL. A cloud project may work well with a managed database service.
If you have a DBA or IT department, you can choose a more powerful database with more administration options. If the developer or hosting provider will maintain it, simplicity matters more.
Licensing is only part of the cost. Also consider hosting, backups, monitoring, support contracts, developer availability, DBA time, and the cost of moving later if you choose poorly.
Most major databases can handle normal business data. The differences become more important when you need advanced reporting, full-text search, JSON fields, audit logs, high availability, integrations, or compliance controls.
For most business web applications, the practical shortlist is SQL Server, MySQL/MariaDB, PostgreSQL, and Oracle.
SQL Server is a strong choice for organizations that already use Microsoft infrastructure, especially Windows Server, Active Directory, Azure, Power BI, .NET applications, or existing SQL Server databases.
Best fit: internal business applications in Microsoft-centered organizations.
Watch out for: licensing, hosting cost, and whether your deployment environment is a natural fit for Microsoft database infrastructure.
MySQL and MariaDB are extremely common in web hosting. If you have used WordPress, Joomla, Drupal, Magento, cPanel hosting, or many web-based applications, you have probably used a MySQL-compatible database.
MySQL supports common relational database features such as joins, views, triggers, stored procedures, JSON, replication, and high availability options. See MySQL technical specifications.
Best fit: standard web applications where hosting availability, cost, and ecosystem support matter.
Watch out for: differences between MySQL and MariaDB, and projects that need more advanced SQL, analytics, or extensibility.
PostgreSQL is a powerful open-source database and a common choice for new custom applications. It has strong SQL support, advanced data types, JSON/JSONB, indexing, full-text search, and extensions.
PostgreSQL documentation recommends jsonb for most JSON use cases because it supports indexing and is faster to process than reparsing stored JSON text. See PostgreSQL JSON documentation and PostgreSQL full-text search.
Best fit: new custom web applications where you want strong features without commercial database licensing.
Watch out for: whether your team or hosting provider can support PostgreSQL well.
Oracle Database is a major enterprise platform. It is common in large organizations, government, finance, healthcare, telecom, and other environments where Oracle is already part of the infrastructure.
Best fit: enterprise applications that need to integrate with existing Oracle systems.
Watch out for: licensing, administration overhead, and whether Oracle is more power than the project really needs.
They may not be the main choice for a typical business web application, but they are useful in the right place.
SQLite does not run as a separate database server. The application reads and writes directly to a database file. It is excellent for local desktop applications, mobile apps, embedded devices, prototypes, and single-user tools. SQLite describes itself as serverless, self-contained, zero-configuration, and transactional. See SQLite serverless documentation.
For a central multi-user business web application, start with SQL Server, MySQL/MariaDB, PostgreSQL, or Oracle instead.
MongoDB and other NoSQL databases can be useful when your data is document-oriented, changes shape frequently, or does not fit neatly into related tables.
For many business applications, though, customers, orders, invoices, users, permissions, products, approvals, tasks, inventory, and audit logs are naturally relational. In those cases, a relational database is usually the simpler starting point.
Choose the database you can live with, not just the one that looks best on paper.
If your organization already has a strong database preference and people who can support it, start there. SQL Server, MySQL/MariaDB, PostgreSQL, and Oracle are all mature enough for serious business applications.
The important question is not only "Which database is best?" It is "Which database is best for this application, this hosting environment, this budget, and this team?"
If you are replacing Microsoft Access, this decision is especially important. Your Access tables and data can often be moved to a server database, and the new web application can then be built around that database.
PHPRunner works with popular database systems and can help create web applications from existing or newly designed database tables. Once the database is selected, you can generate the core application structure and then customize the forms, reports, dashboards, permissions, and business logic your project needs.