> 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 dynamically by asking a question.

Perform an HTTP GET request on the current page URL with the `ask` query parameter, and the optional `goal` query parameter:

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

`ask` is the immediate question: it should be specific, self-contained, and written in natural language.
`goal` is optional and describes the broader end goal you are ultimately trying to accomplish on behalf of the user. GitBook uses it to tailor the answer towards what is most useful for that goal.

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.