Query Database Schema

Quick Start

Use this skill to quickly answer: what tables exist, what columns/types they have, how tables relate, and what constraints/indexes affect query behavior.

When to use this skill

• onboarding onto an unfamiliar database
• before writing joins, aggregations, or migrations
• when app behavior suggests bad assumptions (nullability, defaults, constraints)
• when documenting schema for teammates

Before running queries, collect:

• database engine (postgres/mysql/sqlite)
• database + schema name (if applicable)
• target tables (or suspected domain area)