SQL Joins, GROUP BY, and Aggregation: The Relational Thinking Students Need
SQL is easiest to understand when you think in relations and transformations rather than translating every query into an imaginary nested loop.
2026-09-19
Topic Thread
#postgresql
4 published observations tracking this thread.
PostgreSQL Indexes: Why Queries Get Slow and What an Index Actually Changes
An index is not a magical speed button. It is an additional data structure that can reduce the amount of table work needed for specific query patterns.
2026-09-19
Google Cloud Puts BM25 Inside PostgreSQL for Hybrid AI Search
Native BM25 changes the architecture of hybrid retrieval: applications can combine lexical ranking and vector search against the same PostgreSQL data instead of synchronizing two search systems.
2026-09-19
Database Transactions and ACID: Why 'Save Everything' Is Not a Complete Operation
Transactions are how a database groups related changes into a unit with defined failure and visibility behavior.
2026-09-19