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Top 23 C++ SQL Projects
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Project mention: How to Build a Streaming Deduplication Pipeline with Kafka, GlassFlow, and ClickHouse | dev.to | 2025-05-14
ClickHouse: A fast columnar database. It will be our final destination for clean data. And, for simplicity in this tutorial, we'll cleverly use it as our "memory" or state store to remember which events we've already seen recently.
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InfluxDB
InfluxDB – Built for High-Performance Time Series Workloads. InfluxDB 3 OSS is now GA. Transform, enrich, and act on time series data directly in the database. Automate critical tasks and eliminate the need to move data externally. Download now.
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Project mention: ClickHouse gets lazier (and faster): Introducing lazy materialization | news.ycombinator.com | 2025-04-22
It does, but the performance isn't great apparently: https://github.com/duckdb/duckdb/discussions/10161
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Project mention: SQL powered operating system instrumentation, monitoring, and analytics | news.ycombinator.com | 2024-09-10
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manticoresearch
Easy to use open source fast database for search | Good alternative to Elasticsearch now | Drop-in replacement for E in the ELK soon
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POCO
The POCO C++ Libraries are powerful cross-platform C++ libraries for building network- and internet-based applications that run on desktop, server, mobile, IoT, and embedded systems.
Project mention: Poco C++ Libraries: Build High-Performance Cross-Platform Apps for IoT and More | news.ycombinator.com | 2024-08-28 -
These may be useful reading:
https://github.com/TryGhost/node-sqlite3/issues/408#issue-57...
https://github.com/WiseLibs/better-sqlite3/issues/32#issueco...
Copying a quote from the second:
> The sqlite3 C API serializes all operations (even reads) within a single process. You can parallelize reads to the database but only by having multiple processes, in which case one process being blocked doesn't affect the other processes anyways. In other words, because sqlite3 serializes everything, doing things asynchronously won't speed up database access within a process. It would only free up time for your app to do other things (like HTTP requests to other servers). Unfortunately, the overhead imposed on sqlite3 to serialize asynchronous operations is quite high, making it disadvantageous 95% of the time.
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MariaDB
MariaDB server is a community developed fork of MySQL server. Started by core members of the original MySQL team, MariaDB actively works with outside developers to deliver the most featureful, stable, and sanely licensed open SQL server in the industry. (by MariaDB)
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ydb
YDB is an open source Distributed SQL Database that combines high availability and scalability with strong consistency and ACID transactions
I wonder if this means YDB (from the devs of Clickhouse) will get some traction (https://ydb.tech/) or if there are other massive scale scylladb-types of DB's out there.
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Project mention: Launch HN: ParaQuery (YC X25) – GPU Accelerated Spark/SQL | news.ycombinator.com | 2025-05-12
Cool project, congratulations.
How would you contrast it against HeavyDB?
https://github.com/heavyai/heavydb
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griddb
GridDB is a next-generation open source database that makes time series IoT and big data fast,and easy.
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Project mention: ClickHouse gets lazier (and faster): Introducing lazy materialization | news.ycombinator.com | 2025-04-22
https://github.com/chdb-io/chdb/issues/101#issuecomment-2824...
Ps. I work for ClickHouse
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proton
High-performance, low-footprint SQL database written in C++. Process millions of rows per second from Kafka/Pulsar, Iceberg, or ClickHouse, and seamlessly write results back. Supports powerful features like JOIN, CDC, UPSERT, and LOOKUP, enabling real-time analytics and ETL at scale. (by timeplus-io)
Project mention: Show HN: Open-Source C++ Apache Iceberg Client with Write Support | news.ycombinator.com | 2025-03-20 -
Project mention: Show HN: ImPlot3D – A 3D Plotting Library for Dear ImGui | news.ycombinator.com | 2024-12-18
I use this in a project, but it's more like a source code editor:
https://github.com/BalazsJako/ImGuiColorTextEdit
'Rich' text editing might hit limitations with Dear ImGui's text rendering (e.g. not sure if things like italics, bold or strikethrough are supported out of the box).
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ultimatepp
U++ is a C++ cross-platform rapid application development framework focused on programmer's productivity. It includes a set of libraries (GUI, SQL, Network etc.), and integrated development environment (TheIDE).
Have you ever tried U++? I haven't used it beyond quick and dirty testing but has a decent GUI builder and is a full C++ IDE.
https://www.ultimatepp.org/
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stonedb
StoneDB is an Open-Source MySQL HTAP and MySQL-Native DataBase for OLTP, Real-Time Analytics, a counterpart of MySQLHeatWave. (https://stonedb.io)
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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
C++ SQL related posts
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Waiting for Postgres 18: Accelerating Disk Reads with Asynchronous I/O
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Instant SQL for results as you type
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ClickHouse gets lazier (and faster): Introducing lazy materialization
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Reproducing Hacker News writing style fingerprinting
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Cloudflare R2 Data Catalog: Managed Apache Iceberg tables with zero egress fees
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DuckDB 1.2.2 Released
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Show HN: Open-Source C++ Apache Iceberg Client with Write Support
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A note from our sponsor - SaaSHub
www.saashub.com | 16 May 2025
Index
What are some of the best open-source SQL projects in C++? This list will help you:
| # | Project | Stars |
|---|---|---|
| 1 | ClickHouse | 40,657 |
| 2 | DuckDB | 29,030 |
| 3 | OSQuery | 22,463 |
| 4 | manticoresearch | 10,299 |
| 5 | POCO | 8,997 |
| 6 | better-sqlite3 | 6,090 |
| 7 | MariaDB | 6,041 |
| 8 | ydb | 4,220 |
| 9 | heavydb | 2,996 |
| 10 | picotorrent | 2,698 |
| 11 | sqlcheck | 2,477 |
| 12 | sqlite_orm | 2,449 |
| 13 | griddb | 2,423 |
| 14 | chdb | 2,362 |
| 15 | ytsaurus | 2,024 |
| 16 | proton | 1,791 |
| 17 | ImGuiColorTextEdit | 1,534 |
| 18 | TreeFrog Framework | 1,333 |
| 19 | Firebird | 1,307 |
| 20 | MyScaleDB | 961 |
| 21 | ultimatepp | 882 |
| 22 | stonedb | 873 |
| 23 | sql-parser | 781 |
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