Individual skill
sql-pro
Expert SQL patterns for complex queries, optimization, and cross-database portability — use when writing, tuning, or debugging SQL.
skills/sql-pro/SKILL.md
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## Overview
SQL is the lingua franca of data work, but writing SQL that is both correct and fast
requires more than knowing `SELECT`. This skill covers advanced querying techniques,
portability across dialects (PostgreSQL, MySQL, SQLite, SQL Server), and the
optimization habits that keep queries quick as data grows.
## When to use
- Writing multi-table joins, subqueries, or window functions
- Debugging a query that returns wrong results or runs slowly
- Migrating queries between database dialects (e.g. MySQL → PostgreSQL)
- Reviewing generated or hand-written SQL for correctness and performance
- Building reports, aggregations, or data pipelines in SQL