database-schema-design
Design database schemas with normalization, relationships, and constraints. Use when creating new database schemas, designing tables, or planning data models for PostgreSQL and MySQL.
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Install
Works with every agent the skills CLI supports.
npx skills add https://github.com/aj-geddes/useful-ai-prompts --skill database-schema-design- 01
Install
Run the command in your project. The CLI asks which agents to install for.
- 02
Describe the task
Ask your agent for something this skill covers. It loads database-schema-design automatically when relevant.
- 03
Review the result
The agent follows the SKILL.md steps, scripts and references bundled with the skill.
SKILL.md
The instructions your agent reads when the skill is triggered.
Database Schema Design
Table of Contents
Overview
Design scalable, normalized database schemas with proper relationships, constraints, and data types. Includes normalization techniques, relationship patterns, and constraint strategies.
When to Use
- New database schema design
- Data model planning
- Table structure definition
- Relationship design (1:1, 1:N, N:N)
- Normalization analysis
- Constraint and trigger planning
- Performance optimization at schema level
Quick Start
PostgreSQL - Eliminate Repeating Groups:
-- NOT 1NF: repeating group in single column
CREATE TABLE orders_bad (
id UUID PRIMARY KEY,
customer_name VARCHAR(255),
product_ids VARCHAR(255) -- "1,2,3" - repeating group
);
-- 1NF: separate table for repeating data
CREATE TABLE orders (
id UUID PRIMARY KEY,
customer_name VARCHAR(255),
created_at TIMESTAMP DEFAULT NOW()
);
CREATE TABLE order_items (
id UUID PRIMARY KEY,
order_id UUID NOT NULL,
product_id UUID NOT NULL,
quantity INTEGER NOT NULL,
FOREIGN KEY (order_id) REFERENCES orders(id) ON DELETE CASCADE
);
Reference Guides
Detailed implementations in the references/ directory:
| Guide | Contents |
|---|---|
| First Normal Form (1NF) | First Normal Form (1NF) |
| Second Normal Form (2NF) | Second Normal Form (2NF) |
| Third Normal Form (3NF) | Third Normal Form (3NF) |
| Entity-Relationship Patterns | Entity-Relationship Patterns |
Best Practices
✅ DO
- Follow established patterns and conventions
- Write clean, maintainable code
- Add appropriate documentation
- Test thoroughly before deploying
❌ DON'T
- Skip testing or validation
- Ignore error handling
- Hard-code configuration values
FAQ
What does the database-schema-design skill do?
Design database schemas with normalization, relationships, and constraints. Use when creating new database schemas, designing tables, or planning data models for PostgreSQL and MySQL.
How do I install database-schema-design?
Run npx skills add https://github.com/aj-geddes/useful-ai-prompts --skill database-schema-design in your project. The skills CLI detects the agents you use and copies the skill into the right folder. For Claude Code you can also place the skill folder at ~/.claude/skills/database-schema-design/ (personal) or .claude/skills/database-schema-design/ (project).
Which AI agents can use database-schema-design?
Any agent that supports the open Agent Skills format (a folder with a SKILL.md file), including Claude Code, Codex, Cursor, GitHub Copilot, Gemini CLI, Windsurf, Cline, OpenCode and more.
Is database-schema-design safe to install?
No partner security audit is available yet. Skills can run commands and scripts, so read the SKILL.md and any bundled files before installing.
Who maintains database-schema-design?
It is published by aj-geddes in aj-geddes/useful-ai-prompts. It has 591 recorded installs.
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