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Show HN: Book to help you build a PostgreSQL-like database server from scratch

https://technicaldeft.com/build-a-database-server
4•zetter•1d ago
I just finished writing my book that guides you through building your own SQL database server from scratch.

The software engineering books I've enjoyed the most are the ones that let you learn through writing code and experimentation, which is why I wanted to create a practical book.

More details and a preview at https://technicaldeft.com/build-a-database-server

In summary:

+ Learn how parse and type check SQL

+ Execute complex queries that use JOIN and GROUP BY

+ Challenge yourself with suggested extensions

+ Comparisons with real databases including PostgreSQL, MySQL, SQLite and DuckDB

+ Pick a what language you want to build your implementation in

+ Test suite to help you build and refactor your project

You can use the code CREATE to get 20% off the price.

Show HN: AI game animation sprite generator

https://www.godmodeai.cloud/ai-sprite-generator
107•lyogavin•19h ago•83 comments

Show HN: Air Lab – A portable and open air quality measuring device

https://networkedartifacts.com/airlab/simulator
459•256dpi•2d ago•182 comments

Show HN: Cpdown – Copy any webpage/YouTube subtitle as clean Markdown(LLM-ready)

https://github.com/ysm-dev/cpdown
6•ysm0622•12h ago•1 comments

Show HN: Ask-human-mcp – zero-config human-in-loop hatch to stop hallucinations

https://masonyarbrough.com/blog/ask-human
117•echollama•1d ago•53 comments

Show HN: Lambduck, a Functional Programming Brainfuck

https://imjakingit.github.io/lambduck/
65•jorkingit•1d ago•26 comments

Show HN: Claude Composer

https://github.com/possibilities/claude-composer
151•mikebannister•1d ago•85 comments

Show HN: Mustardwatch: Detect what files a program uses, rerun when they change

https://github.com/shachaf/mustardwatch
10•shachaf•17h ago•0 comments

Show HN: iOS Screen Time from a REST API

https://www.thescreentimenetwork.com/api/
101•anteloper•1d ago•50 comments

Show HN: GPT image editing, but for 3D models

https://www.adamcad.com/
179•zachdive•2d ago•86 comments

Show HN: Container Use for Agents

https://github.com/dagger/container-use
73•aluzzardi•1d ago•17 comments

Show HN: ClickStack – Open-source Datadog alternative by ClickHouse and HyperDX

https://github.com/hyperdxio/hyperdx
234•mikeshi42•1d ago•68 comments

Show HN: Asteroid Impact Probability Tool

https://b612foundation.org/asteroid-institute-launch-of-adamimpact-probability-demo-to-analyze-and-visualize-future-impact-risk/
3•dremy•18h ago•0 comments

Show HN: SQLAlchemy just the core – a better way

https://github.com/sayanarijit/sqla-fancy-core
4•sayanarijit•15h ago•0 comments

Show HN: I made a 3D SVG Renderer that projects textures without rasterization

https://seve.blog/p/i-made-a-3d-svg-renderer-that-projects
206•seveibar•2d ago•70 comments

Show HN: Bridgit – In-Person-First Networking

https://www.bridgitsocial.com/
3•amfooladgar•16h ago•3 comments

Show HN: Televyze, Your IPTV OS

https://televyze.com
4•1mbsite•17h ago•0 comments

Show HN: String Flux – Simplify everyday string transformations for developers

https://stringflux.io
16•eaglepeak•1d ago•7 comments

Show HN: Arxivlens – Save Hours Researching Scientific Literature on ArXiv

https://arxivlens.com/
3•Ava234•19h ago•0 comments

Show HN: Grab a Random ArXiv Paper

https://jepedersen.dk/arxiv.html
13•jegp•1d ago•2 comments

Show HN: Kan.bn – An open-source alterative to Trello

https://github.com/kanbn/kan
505•henryball•5d ago•218 comments

Show HN: Kobuddy – Send Articles to Your Kobo E-Reader

https://kobuddy.app/
2•No-Arugula5818•20h ago•1 comments

Show HN: CensorIt – Remove vocals or music from uploaded audio files

https://censorit.org/signin
4•mr_aaron•20h ago•0 comments

Show HN: I build one absurd web project every month

https://absurd.website
290•absurdwebsite•4d ago•67 comments

Show HN: I wrote a Java decompiler in pure C language

https://github.com/neocanable/garlic
168•neocanable•4d ago•94 comments

Show HN: EndBOX – A toy-like retro computer for EndBASIC

https://www.endbasic.dev/2025/06/unveiling-the-endbox.html
5•jmmv•21h ago•0 comments

Show HN: App.build, an open-source AI agent that builds full-stack apps

https://www.app.build/
89•davidgomes•2d ago•13 comments

Show HN: Solomon's Agent - a CLI to simplify the web

https://github.com/jadbox/solomonagent
3•jadbox•21h ago•1 comments

Show HN: Lightweight Durable Workflows Built on Postgres

https://github.com/dbos-inc/dbos-transact-python
5•qianli_cs•22h ago•0 comments

Show HN: Tape/Z – a toolkit for analysing z/OS assembler (HLASM) code

https://github.com/avishek-sen-gupta/tape-z
2•armorer•22h ago•0 comments

Show HN: Localize React apps without rewriting code

https://github.com/lingodotdev/lingo.dev
87•maxpr•3d ago•71 comments