# data-n-plus-one

> N+1 queries execute one query per item in a loop. Batch them into a single query using arrays or JOINs.

- Source: https://doutorai.pt/en/components/skills__data-n-plus-one
- Type: Skills
- Category: Databases
- Downloads: 0
- Site: Doutor AI (https://doutorai.pt/en) - AI tools for small businesses

An open-source community component, curated and adapted by Doutor AI.

## 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.

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

## Install (Claude Code)

```bash
mkdir -p .claude/skills/data-n-plus-one && curl -fsSL https://doutorai.pt/data/lib/skills__data-n-plus-one.md -o .claude/skills/data-n-plus-one/SKILL.md
```

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

## Content

````
---
title: Eliminate N+1 Queries with Batch Loading
impact: MEDIUM-HIGH
impactDescription: 10-100x fewer database round trips
tags: n-plus-one, batch, performance, queries
---

## Eliminate N+1 Queries with Batch Loading

N+1 queries execute one query per item in a loop. Batch them into a single query using arrays or JOINs.

**Incorrect (N+1 queries):**

```sql
-- First query: get all users
select id from users where active = true;  -- Returns 100 IDs

-- Then N queries, one per user
select * from orders where user_id = 1;
select * from orders where user_id = 2;
select * from orders where user

- 🔒 Full content on the Pro plan (€7.99/month) -
````

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Content by Doutor AI (https://doutorai.pt/en). When quoting, please cite the source: https://doutorai.pt/en/components/skills__data-n-plus-one