> For the complete documentation index, see [llms.txt](https://docs.e6data.com/query-engine/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.e6data.com/query-engine/reference/reference.md).

# Overview

Reference material for e6data - SQL functions, error codes, regions, limitations, and platform behavior.

Lookup-style reference material. Use it when you know what you're looking for and need the specifics.

## What's here

| Section                                                                              | Use for                                                                    |
| ------------------------------------------------------------------------------------ | -------------------------------------------------------------------------- |
| [SQL reference](/query-engine/reference/sql-reference.md)                            | SQL functions, data types, syntax                                          |
| [Error codes](/query-engine/reference/error-codes.md)                                | Look up what an error code means and how to fix it                         |
| [Limitations](/query-engine/reference/limitations.md)                                | Known limits and constraints                                               |
| [Services and dependencies](/query-engine/reference/services-and-dependencies.md)    | Supported regions per cloud                                                |
| [Platform reference](/query-engine/reference/platform-reference/version-upgrades.md) | Version upgrades, release notes format, resource naming, platform behavior |

## Where to go for non-reference content

* For tutorials and how-tos, see [Guides](/query-engine/guides/guides.md)
* For getting-started material, see [Get Started](/query-engine/get-started/readme.md)
* For driver/API documentation, see [Developer](/query-engine/developers/readme-2.md)
* For common questions, see the FAQs in [Guides](/query-engine/guides/guides.md) (per deployment path)


---

# Agent Instructions
This documentation is published with GitBook. GitBook is the documentation platform designed so that both humans and AI agents can read, navigate, and reason over technical content effectively. Learn more at gitbook.com.

## Querying This Documentation
If you need additional information that is not directly available in this page, you can query the documentation by asking a question.

Perform an HTTP GET request on the following URL with the `ask` and `goal` query parameters:

```
GET https://docs.e6data.com/query-engine/reference/reference.md?ask=<question>&goal=<user_goal>
```

`ask` is the immediate question: it should be specific, self-contained, and written in natural language.
`goal` is what the user is ultimately trying to achieve, the reason they need the answer. Sharing it helps GitBook give you a better, more relevant answer. A goal is most helpful when it describes the outcome the user wants rather than restating the question. For example, with `ask=how do I create an API token`, a goal like `automate deployments from our CI pipeline` lets GitBook tailor the answer to that use case.

The response will contain a direct answer to the question and relevant excerpts and sources from the documentation.

Use this mechanism when the answer is not explicitly present in the current page, you need clarification or additional context, or you want to retrieve related documentation sections.