This guide explains how LIMIT and OFFSET work in PostgreSQL, their use cases for pagination, why large OFFSET values cause performance issues, and when to switch to cursor-based pagination. It includes syntax examples, mandatory ORDER BY requirements, common pitfalls, and alternative methods aligned with PostgreSQL and GitHub REST API standards.
PostgreSQL / database pagination / LIMIT / OFFSET / cursor-based pagination / query performance
Understand the differences between offset-based and cursor-based pagination and when to use each, especially when dealing with frequently changing datasets.
api / pagination / rest / offset / cursor / data consistency / web development
Compare RESTRICT, CASCADE and SET NULL using a small isolated example, then check the actual constraint and dependent rows before changing real data.
PostgreSQL / SQL / Foreign keys / Transactions
Select one whole event per account with an explicit tie-breaker and a deliberate policy for missing timestamps.
data
This article explains how to choose effective chunk boundaries and overlap in retrieval-augmented generation (RAG) systems, comparing fixed-size and document-aware strategies. Using a hypothetical support note example, it demonstrates the risks of splitting across semantic units and shows how metadata and overlap can preserve context. The guidance is based on Microsoft Azure documentation for chunking in vector search and RAG workflows.
RAG / chunking / Azure AI Search / information retrieval / document processing
A detailed technical breakdown of the differences between WHERE and HAVING clauses, focusing on execution order, aggregate function compatibility, and performance optimization strategies.
SQL / PostgreSQL / Database / Query Optimization / Data Analysis
Find the expensive step and distinguish estimates from measurements.
PostgreSQL / SQL / Performance