https://antoineboucher.info/CV/blog/tags/postgresql/Recent content in PostgreSQL on Antoine BoucherHugoen-usMon, 13 Apr 2026 12:00:00 -0400https://antoineboucher.info/CV/blog/posts/vector-databases-similar-movies/Mon, 13 Apr 2026 12:00:00 -0400https://antoineboucher.info/CV/blog/posts/vector-databases-similar-movies/<p>This is a single walkthrough of a <strong>movie similarity</strong> thread: <strong>Part 1</strong> stores embeddings in <strong>PostgreSQL + pgvector</strong> and runs nearest-neighbor search in SQL; <strong>Part 2</strong> uses <strong>Qdrant</strong> with <strong>MovieLens</strong> (dense text vectors for semantic search and sparse rating vectors for collaborative-style recommendations); <strong>Part 3</strong> turns the same pgvector-backed catalog into the retrieval layer for a small <strong>RAG</strong> pipeline with <strong>LangChain</strong> and <strong>Ollama</strong>. Below are short GIFs from that work (<code>movie-similarities-1.gif</code> … <code>3.gif</code> in this page bundle).</p>