# Microsoft SQL Server vs PostgreSQL

**Leader by vioscaleAI score:** PostgreSQL

| Attribute | Microsoft SQL Server | PostgreSQL |
|---|---|---|
| **vioscaleAI score** | 43.9 (7% (low)) | 61.3 (60% (medium)) |
| activity.commits_last_30d | - | 100 |
| adoption.dependent_repos | - | 0 |
| adoption.github_stars | - | 22,285 |
| adoption.stackoverflow_questions | - | 170,000 |
| content.faq | `[{"answer":"SQL Server 2025 is Microsoft's enterprise database system built with strong security, high performance, and availability features. It includes native AI capabilities to help modernize data platforms and accelerate application development. It is indexed under Relational Databases.","source":"https://www.microsoft.com/en-us/sql-server","question":"What is Microsoft SQL Server?","confidence":0.6},{"answer":"Microsoft SQL Server supports Windows, Linux and a command-line interface. Platforms we have not confirmed are simply not listed here rather than ruled out.","source":"https://www.microsoft.com/en-us/sql-server","question":"What platforms does Microsoft SQL Server support?","confidence":0.6},{"answer":"Yes. Microsoft SQL Server can be deployed cloud / SaaS, on-premise and self-hosted, so it does not have to run on the vendor's infrastructure.","source":"https://www.microsoft.com/en-us/sql-server","question":"Can Microsoft SQL Server be self-hosted?","confidence":0.6},{"answer":"We have confirmed 3 integrations for Microsoft SQL Server, including LangChain, Semantic Kernel and Entity Framework Core. This is what we could verify from public sources, so the vendor may support others we have not indexed.","source":"https://www.microsoft.com/en-us/sql-server","question":"What does Microsoft SQL Server integrate with?","confidence":0.6},{"answer":"We have independently confirmed GDPR for Microsoft SQL Server. Certifications we do not list are ones we have not been able to verify from public sources, which is not the same as Microsoft SQL Server not holding them. Always confirm compliance directly before you rely on it.","source":"https://www.microsoft.com/en-us/legal/compliance/recycling","question":"What security certifications does Microsoft SQL Server have?","confidence":0.7},{"answer":"Microsoft SQL Server is available worldwide. The vendor is headquartered in the United States.","source":"https://www.microsoft.com/golf/etc.clientlibs/onecloud/components/content/reimagine/atomic/carousel/v1/carousel/clientlibs/pricing-styles.ACSHASHbcdafd3e07059ae596973551430292fc.min.css","question":"Where is Microsoft SQL Server available?","confidence":0.75}]` | `[{"answer":"PostgreSQL is a free, open-source relational database system that emphasizes extensibility and standards compliance. It provides robust support for complex data types and advanced query capabilities, making it suitable for both small applications and large-scale enterprise deployments.","source":"https://www.postgresql.org","question":"What is PostgreSQL?","confidence":0.95},{"answer":"PostgreSQL is open-source and available at no cost under the PostgreSQL License. Organizations can deploy and modify the software without paying licensing fees, though managed hosting services may charge for their infrastructure and support.","source":"https://www.postgresql.org/about/licence/","question":"Is PostgreSQL free to use?","confidence":0.95},{"answer":"PostgreSQL is cross-platform and runs on Linux, Unix, Windows, macOS, and other operating systems. This broad platform support makes it accessible for diverse infrastructure environments.","source":"https://www.postgresql.org/download/","question":"What operating systems does PostgreSQL support?","confidence":0.95},{"answer":"PostgreSQL fully implements ACID (Atomicity, Consistency, Isolation, Durability) transactions, ensuring that database operations are reliable and data remains consistent even in the face of failures or concurrent access patterns.","source":"https://www.postgresql.org/docs/current/tutorial-concepts.html","question":"Does PostgreSQL guarantee data integrity through ACID compliance?","confidence":0.95},{"answer":"Organizations often evaluate PostgreSQL alongside MySQL for relational workloads, Oracle or Microsoft SQL Server for large enterprise deployments, and NoSQL systems like MongoDB for document-based requirements. The choice depends on specific priorities around complexity, scalability, and data structure needs.","source":"https://www.postgresql.org","question":"What are common database alternatives to PostgreSQL?","confidence":0.9},{"answer":"PostgreSQL can be deployed on self-managed infrastructure using binary installations or containerization, or through managed database services from cloud platforms such as AWS RDS, Google Cloud SQL, and Azure Database for PostgreSQL. Managed services typically handle automated backups, scaling, and routine maintenance.","source":"https://www.postgresql.org/download/","question":"How can developers deploy PostgreSQL?","confidence":0.9},{"answer":"PostgreSQL supports JSON/JSONB data types for semi-structured data, full-text search capabilities, window functions, Common Table Expressions, and custom extensions through its extensibility architecture. These features reduce the need for application-layer complexity and the addition of specialized separate systems.","source":"https://www.postgresql.org/docs/current/sql-syntax.html","question":"What advanced features enable complex analytical and transactional work in PostgreSQL?","confidence":0.9},{"answer":"PostgreSQL is used in production by thousands of organizations ranging from startups to large enterprises. It includes comprehensive features for data replication, backup strategies, and high-availability configurations, making it a reliable choice for applications where data consistency and uptime are critical.","source":"https://www.postgresql.org/","question":"Is PostgreSQL suitable for production and mission-critical applications?","confidence":0.9}]` |
| deployment.options | `{"cloud":true,"self_hosted":true}` | `{"cloud":true,"self_hosted":true}` |
| description.long | SQL Server 2025 is Microsoft's enterprise database system built with strong security, high performance, and availability features. It includes native AI capabilities to help modernize data platforms and accelerate application development. | PostgreSQL is an open source relational database with over 35 years of active development. It supports transactions, user-defined functions, and a broad subset of SQL, widely used for data storage and retrieval in applications ranging from small projects to enterprise deployments. |
| features.capabilities | `{"sql_model":"full_sql","geo_spatial":"native","json_document":true,"license_class":"proprietary","acid_transactions":"full"}` | `{"hosting":"both","sql_model":"full_sql","data_model":"relational","deployment":"self_hosted","serverless":false,"geo_spatial":"extension","sql_support":true,"extensibility":true,"json_document":true,"license_class":"permissive","managed_cloud":true,"vector_search":true,"horizontal_scale":"read_replica","acid_transactions":"full","automatic_failover":true,"horizontal_scaling":true}` |
| integrations.count | 3 | 6 |
| integrations.list | `[{"name":"LangChain"},{"name":"Semantic Kernel"},{"name":"Entity Framework Core"}]` | `[{"name":"CloudNativePG"},{"name":"Kubernetes"},{"name":"Patroni"},{"name":"pgAdmin"},{"name":"pgVector"},{"name":"PostGIS"},{"name":"pgAudit"},{"name":"Spock"},{"name":"Cilium"},{"name":"Submariner"}]` |
| language.primary | - | C |
| license.spdx | - | PostgreSQL |
| market.availability | `{"primaryMarkets":["US"],"availabilityScope":"global","availableCountries":[],"notAvailableCountries":[]}` | `{"source":"https://www.postgresql.org","confidence":0.95,"primaryMarkets":[],"availabilityScope":"global","availableCountries":[],"notAvailableCountries":[]}` |
| platform.support | `{"cli":true,"windows":true}` | `{"mac":true,"linux":true,"windows":true}` |
| pricing | - | `{"type":"open_source","freeTier":true,"sourceUrl":"https://www.postgresql.org","retrievedAt":"2026-08-14T12:11:14.172Z"}` |
| pricing.free_tier | - | yes |
| pricing.model | commercial | open_source |
| pricing.price_level | - | free |
| release.cadence_days | - | 90 |
| security.disclosure_policy | yes | yes |
| security.gdpr | yes | - |
| security.scorecard | - | 6.1 |
| security.trust_center | https://www.microsoft.com/en-us/security | https://www.postgresql.org/support/security/faq/2013-04-04/ |
| security.vulnerabilities | - | `{"count":0,"source":"https://advisories.ecosyste.ms/api/v1/advisories?ecosystem=helm&package_name=openstack-helm%2Fpostgresql&per_page=100","last_12m":0,"max_severity":null}` |

## Capabilities (Relational Databases)

| Capability | Microsoft SQL Server | PostgreSQL |
|---|:--:|:--:|
| **Core** |  |  |
| SQL model | Full SQL | Full SQL |
| **Transactions** |  |  |
| ACID transactions | Full | Full |
| Highest isolation level | - | - |
| **Consistency** |  |  |
| Consistency | - | - |
| **Scale** |  |  |
| Horizontal scale | - | Read replicas |
| **Replication** |  |  |
| Replication | - | - |
| **Availability** |  |  |
| Automatic failover / HA | - | ✓ |
| **Deployment** |  |  |
| Deployment | - | Self-hosted |
| Serverless / scale-to-zero | - | ✗ |
| **Compatibility** |  |  |
| Wire compatibility | - | - |
| **Extensibility** |  |  |
| Extensions / plugins / UDFs | - | ✓ |
| **Licensing** |  |  |
| Licence class | Proprietary | Permissive OSS |
| **Data types** |  |  |
| JSON / document support | ✓ | ✓ |
| Geo / spatial | Native | Extension |

*Source: vioscaleAI. Generated 2026-10-16T20:37:42.566Z. "-" = undocumented, not absent.*