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ClaudSkills / Engineering / databases

SQL Query Optimization

Category: Engineering  ·  Sub-category: databases  ·  Last updated:
SQL query optimization for PostgreSQL/MySQL with indexing, EXPLAIN analysis. Use for slow queries, N+1 problems, missing indexes, or encountering sequential scans, OFFSET pagination, temp table spills, inefficient JOINs. Keywords: sql optimization, query performance, database indexes, explain analyze, slow queries, n+1 problem, query plan, index strategy, composite index, covering index, postgresql performance, mysql optimization, query rewriting, prepared statements, connection pooling, sequential scan, missing index, SELECT *, LIMIT optimization, subquery performance, pagination, cursor based pagination, batch operations, pg_stat_statements, full-text search, bitmap scan, index only scan, query tuning, database performance, cache hit ratio, work_mem, shared_buffers, database monitoring
Security AStatic scan found no risk patternsHow grading works ›

From the source SKILL.md

Status: Production Ready ✅ Last Updated: 2025-12-15 Latest Versions: PostgreSQL 17, MySQL 8.4 Dependencies: None

What this skill does

SQL Query Optimization is a community-contributed Claude Code skill in the databases sub-category. It ships as a SKILL.md file that Claude Code auto-discovers under ~/.claude/skills/sql-query-optimization/ and loads when your prompt matches the skill's trigger.

Who uses this skill

The SQL Query Optimization Claude Code skill is built for software engineers, backend developers, full-stack teams, and technical leads building and maintaining production systems. It's part of ClaudSkills (also referred to as Claude Skills or Claude Code Skills) — the open community-curated registry of 159,000+ SKILL.md files for Anthropic's Claude Code agent and the wider Claude ecosystem (Claude API, Claude Agent SDK).

How to install

Free

Manual install (2 steps)

mkdir -p ~/.claude/skills/sql-query-optimization
curl -L https://claudskills.com/skills/sql-query-optimization/SKILL.md \
  -o ~/.claude/skills/sql-query-optimization/SKILL.md

Or just download SKILL.md directly and drop it into ~/.claude/skills/sql-query-optimization/. Claude Code auto-discovers it on next session.

Skills live at ~/.claude/skills/sql-query-optimization/SKILL.md on macOS/Linux, or %USERPROFILE%\.claude\skills\sql-query-optimization\SKILL.md on Windows. See the full install guide for step-by-step instructions.

Telegram

📱 Install from your phone or desktop Telegram

Open @claudskills_bot on Telegram, tap Open Desktop App, and the desktop app installs this skill for you. Or share the bot link with a colleague — they get the same one-tap install. Learn more →

Pro

One-click install via the desktop app

The ClaudSkills desktop app installs any skill directly into ~/.claude/skills/ with one click — no terminal required. Pro starts at $9/mo or $149 lifetime.

Pro

For the full experience including quality scoring and one-click install features for each skill — upgrade to Pro.

See pricing → Download desktop app

Frequently asked questions

How do I install the SQL Query Optimization Claude Code skill?
Install via the ClaudSkills desktop app (one click) or copy SKILL.md from the source repository to ~/.claude/skills/sql-query-optimization/SKILL.md and restart Claude Code. Both flows are detailed at claudskills.com/install/.
What does the SQL Query Optimization skill do?
SQL query optimization for PostgreSQL/MySQL with indexing, EXPLAIN analysis. Use for slow queries, N+1 problems, missing indexes, or encountering sequential scans, OFFSET pagination, temp table spills, inefficient JOINs. Keywords: sql optimization, query performance, database indexes, explain analyze, slow queries, n+1 problem, query plan, index strategy, composite index, covering index, postgresql performance, mysql optimization, query rewriting, prepared statements, connection pooling, sequential scan, missing index, SELECT *, LIMIT optimization, subquery performance, pagination, cursor based pagination, batch operations, pg_stat_statements, full-text search, bitmap scan, index only scan, query tuning, database performance, cache hit ratio, work_mem, shared_buffers, database monitoring
Is this skill free to install?
Yes. ClaudSkills is an open registry — every skill keeps its source repository's license, and manual install via copy is free. ClaudSkills Pro ($9/mo, $79/yr, or $149 one-time) adds one-click install via the desktop app and a multi-signal Quality Score.
When should I use the SQL Query Optimization skill?
Use SQL Query Optimization when your Claude Code task falls under the Engineering category — specifically in the databases area. Claude Code auto-discovers installed skills and invokes the right one based on the task description, so you can also ask Claude directly (e.g. "use SQL Query Optimization" or describe the task and let Claude pick). Browse related skills at /category/engineering/.
What is a Claude Code skill and how does the SQL Query Optimization skill fit in?
A Claude Code skill is a SKILL.md file that lives under ~/.claude/skills/<name>/ and tells the Claude Code CLI agent how to perform a specific task (instructions, prompts, allowed tools). Skills are auto-discovered at session start. SQL Query Optimization is one of 67,000+ skills indexed in the open ClaudSkills catalog, classified under the Engineering category. Learn more at /learn/what-is-a-claude-skill/.

Attribution & license

Cite this skill

If you reference this skill in a blog post, paper, or documentation, you can cite it as:

APA
bingeli1379. (2026). SQL Query Optimization [Claude Code skill]. ClaudSkills. https://claudskills.com/skills/sql-query-optimization/
BibTeX
@misc{sql-query-optimization-2026,
  author    = {bingeli1379},
  title     = {SQL Query Optimization [Claude Code skill]},
  year      = {2026},
  publisher = {ClaudSkills},
  url       = {https://claudskills.com/skills/sql-query-optimization/}
}

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Browse all Engineering skills → Top 100 skills
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