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Top 23 C SQL Projects
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TDengine
High-performance, scalable time-series database designed for Industrial IoT (IIoT) scenarios
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TimescaleDB
A time-series database for high-performance real-time analytics packaged as a Postgres extension
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Project mention: DocumentDB – a MongoDB compatible open-source database | news.ycombinator.com | 2026-06-29
Beyond other reason listed in the comments, Microsoft is heavily invested in Postgres. They bought Postgres sharding company (https://www.citusdata.com) and apparently it sees a ton of use internally even for newer Greenfield projects. Also, if check recent commits to Postgres, you will find Microsoft employees all over commit history.
As I've commented several times before, MSSQL appears to be on life support. It makes them a ton of money and it's supported in same way AS/400 is supported. Sure, Microsoft will take your money but don't expect a lot in return.
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yugabyte-db
YugabyteDB - the cloud native distributed SQL database for mission-critical applications.
Defaults may be inconsistent. SELECT FOR UPDATE without OF locks all joined rows, but UPDATE on a join behaves differently as we will demonstrate below. Column-level locking also raises another issue without joins: check constraints must see a consistent state, even for columns that were not updated (see the now-fixed YugabyteDB issue: https://github.com/yugabyte/yugabyte-db/issues/15196).
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orioledb
OrioleDB – building a modern cloud-native storage engine (... and solving some PostgreSQL wicked problems)
Project mention: Postgres rewritten in Rust v0.2, now faster than Postgres and ClickHouse | news.ycombinator.com | 2026-07-30Port in OrioleDB next please. If our wish-granting really is at such a state. https://github.com/orioledb/orioledb
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cloudberry
One advanced and mature open-source MPP (Massively Parallel Processing) database. Open source alternative to Greenplum Database.
Project mention: Migrate the legacy Greenplum to Apache Cloudberry with cbcopy | dev.to | 2025-12-16### cbcopy Parameters Reference (Refer to the cbcopy parameter documentation and examples for complete usage and configuration guidance.) ## Welcome to Apache Cloudberry: - **Visit the website:** https://cloudberry.apache.org - **Follow us on GitHub:** https://github.com/apache/cloudberry - **Join Slack workspace:** https://apache-cloudberry.slack.com - **Dev mailing list:** - To subscribe to dev mailing list: Send an email to `dev-subscribe@cloudberry.apache.org` - To browse past dev mailing list discussions: https://lists.apache.org/list.html?dev@cloudberry.apache.org
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pmacct
pmacct is a small set of multi-purpose passive network monitoring tools [NetFlow IPFIX sFlow libpcap BGP BMP RPKI IGP Streaming Telemetry].
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virtuoso-opensource
Virtuoso is a high-performance and scalable Multi-Model RDBMS, Data Integration Middleware, Linked Data Deployment, and HTTP Application Server Platform
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graphqlite
A SQLite extension that adds graph database capabilities with Cypher query language support and built-in graph algorithms. (by colliery-io)
Project mention: GraphQLite, Graph Network Extension on Top of SQLite | news.ycombinator.com | 2026-02-10 -
openHalo
openHalo provides the capability for PostgreSQL to work with applications written for MySQL but provides much more better performance than MySQL.
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I wrapped zsv, a SIMD-accelerated CSV parser written in C, into a Ruby gem. SIMD means it uses special CPU instructions to process multiple bytes at once - the same tech that makes video encoding and game physics fast.
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cubrid
CUBRID is a comprehensive open source relational database management system highly optimized for Web Applications.
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https://github.com/ClickHouse/pg_clickhouse/blob/main/doc/of...
We're working on a chdb based mechanism to copy to/from s3, maybe with fdw on top we can back table in s3
You can try similar things with pg_duckdb & pg_lake
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NOTE:
The open source projects on this list are ordered by number of github stars.
The number of mentions indicates repo mentiontions in the last 12 Months or
since we started tracking (Dec 2020).
C SQL discussion
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Show HN: Pg-status – lightweight HTTP sidecar for PG master/replica discovery
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Readsb ADS-B Aircraft Local State Archive
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SQLite Is a Library of Congress Recommended Storage Format
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TimescaleDB VS arc - a user suggested alternative
2 projects | 26 Apr 2026 -
Show HN: ClickHouse Managed Postgres
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A note from our sponsor - SaaSHub
www.saashub.com | 19 Aug 2026
Index
What are some of the best open-source SQL projects in C? This list will help you:
| # | Project | Stars |
|---|---|---|
| 1 | TDengine | 25,068 |
| 2 | TimescaleDB | 23,335 |
| 3 | citus | 12,688 |
| 4 | yugabyte-db | 10,468 |
| 5 | orioledb | 4,162 |
| 6 | PolarDB-for-PostgreSQL | 3,190 |
| 7 | PipelineDB | 2,661 |
| 8 | cloudberry | 1,319 |
| 9 | sqlite-gui | 1,247 |
| 10 | pmacct | 1,233 |
| 11 | virtuoso-opensource | 971 |
| 12 | pgsodium | 609 |
| 13 | proftpd | 597 |
| 14 | godror | 596 |
| 15 | graphqlite | 438 |
| 16 | openHalo | 437 |
| 17 | zsv | 395 |
| 18 | cubrid | 289 |
| 19 | sqltorrent | 288 |
| 20 | duckdb-sqlite | 288 |
| 21 | pg_clickhouse | 276 |
| 22 | osquery-extensions | 273 |
| 23 | crossdb | 257 |
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