schema-data-types

Using the right data types reduces storage, improves query performance, and prevents bugs.

Skills
Databases
7

What it does and how to use it

A skill that teaches Claude Code to do databases tasks well. It is packaged knowledge the model uses whenever it is relevant.

Install the skill (command above).
In Claude Code, describe what you need - the skill turns on by itself when the context fits.
No commands to memorize: you talk in plain language and the skill does the rest.

Install (Claude Code)

mkdir -p .claude/skills/schema-data-types && curl -fsSL https://doutorai.pt/data/lib/skills__schema-data-types.md -o .claude/skills/schema-data-types/SKILL.md

Paste this command into the terminal, in your project folder, and the component installs automatically.

Content

---
title: Choose Appropriate Data Types
impact: HIGH
impactDescription: 50% storage reduction, faster comparisons
tags: data-types, schema, storage, performance
---

## Choose Appropriate Data Types

Using the right data types reduces storage, improves query performance, and prevents bugs.

**Incorrect (wrong data types):**

```sql
create table users (
  id int,                    -- Will overflow at 2.1 billion
  email varchar(255),        -- Unnecessary length limit
  created_at timestamp,      -- Missing timezone info
  is_active varchar(5),      -- String for boolean
  price varchar(20)  

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