---
warning: DO NOT CHANGE THIS MANUALLY, THIS IS GENERATED BY https://github.com/duckdb/community-extensions repository, check README there
title: drex
excerpt: |
  DuckDB Community Extensions
  Ask typed questions about each row in SQL: yes/no probabilities, labels and scores from Nace's Drex decision models

extension:
  name: drex
  description: "Ask typed questions about each row in SQL: yes/no probabilities, labels and scores from Nace's Drex decision models"
  version: 0.1.0
  language: C++
  build: cmake
  license: MIT
  excluded_platforms: "wasm_mvp;wasm_eh;wasm_threads"
  opt_in_platforms: "osx_amd64"
  maintainers:
    - mkaratayev

repo:
  github: nace-ai/drex-duckdb
  # v0.1.0, the commit the tag points at (a SHA rather than the tag name: a tag can be moved)
  ref: 8b48eac1ec6e2c625fdf1f8a5b4add27c3570f56

docs:
  hello_world: |
    INSTALL drex FROM community;
    LOAD drex;
    -- A Drex API key from https://console.nace.ai
    CREATE SECRET (TYPE nace, API_KEY 'nace_sk_...');
    -- The probability that the answer is yes
    SELECT prompt_drex('I was charged twice for my order', 'Is this a refund request?') AS refund;
    -- One label, with every label's probability
    SELECT prompt_drex('I was charged twice for my order', 'Which team should handle it?',
                       choice := ['billing', 'shipping', 'tech']) AS team;

  extended_description: |
    `drex` connects DuckDB to Drex, Nace's decision models, to classify text, score rows and return
    probabilities as native SQL values. `prompt_drex` asks a typed question about each row:

    - **Yes/no** (`noul`, the default) returns a `DOUBLE`, the probability that the answer is true.
    - **One label of a set** (`choice := [...]`) returns a `STRUCT` with the label, every label's probability
      and a confidence.
    - **A score on ordered levels** (`score := [...]`) returns a `STRUCT` with the score, every level's
      probability and a confidence.
    - **Several questions at once** (`questions := {...}`) asks up to 512 in one request per row and returns
      one struct field per question.

    The arguments and result types follow MotherDuck's `prompt_jev`, plus `model :=` (the default is
    `drex-v2.0`). Inputs can be `VARCHAR`, `JSON`, or a `BLOB` or `BLOB[]` of PNG, JPEG or WebP images on an
    image-capable model such as `drex-max`. `drex_decide` sends JSON state and questions and returns the
    API's answer as JSON.

    **Credentials.** `CREATE SECRET (TYPE nace, PROVIDER env)` reads `NACE_API_KEY` (and an optional
    `NACE_BASE_URL`) from the environment, which keeps the key out of SQL history.

    **Requests.** Each evaluated non-NULL row normally makes one request. Requests run concurrently
    (`drex_max_concurrency`, 8 by default, or `concurrency := N` per call), with an optional requests-per-minute
    cap (`drex_max_rpm`). Transient failures and rate limits are retried within a bounded budget, honoring
    the server's retry headers. A row the API refuses (an oversized input, an invalid image) returns NULL
    with a warning; authentication, billing and unknown models fail the query.

    - README: https://github.com/nace-ai/drex-duckdb
    - SQL API reference: https://github.com/nace-ai/drex-duckdb/blob/v0.1.0/docs/API.md
    - Issues: https://github.com/nace-ai/drex-duckdb/issues

extension_star_count: 0
extension_star_count_pretty: 0
extension_download_count: null
extension_download_count_pretty: n/a
image: '/images/community_extensions/social_preview/preview_community_extension_drex.png'
layout: community_extension_doc
---
### Compatibility Matrix

This table covers all DuckDB releases that have not reached [end-of-life](https://duckdb.org/release_calendar), including LTS releases, and shows the 2 most recent patch releases of each. Older patch releases are not listed, but the extension may be available for them as well.

<div class="extension_compatibility_table"></div>

| Platform | 1.4.4 | 1.4.5 | 1.5.5 | 1.5.6 | 2.0.0 |
| :--- | :---: | :---: | :---: | :---: | :---: |
| Linux AMD64 | ❌ | ❌ | ❌ | ❌ | ✅ |
| Linux ARM64 | ❌ | ❌ | ❌ | ❌ | ✅ |
| macOS AMD64 | ❌ | ❌ | ❌ | ❌ | ✅ |
| macOS ARM64 | ❌ | ❌ | ❌ | ❌ | ✅ |
| Windows AMD64 | ❌ | ❌ | ❌ | ❌ | ✅ |
| Windows ARM64 | ❌ | ❌ | ❌ | ❌ | ❌ |
| WebAssembly | ❌ | ❌ | ❌ | ❌ | ❌ |

### Installing and Loading
```sql
INSTALL {{ page.extension.name }} FROM community;
LOAD {{ page.extension.name }};
```

{% if page.docs.hello_world %}
### Example
```sql
{{ page.docs.hello_world }}```
{% endif %}

{% if page.docs.extended_description %}
### About {{ page.extension.name }}
{{ page.docs.extended_description }}
{% endif %}
### Added Functions

<div class="extension_functions_table"></div>

| function_name | function_type | description | comment | examples |
|---------------|---------------|-------------|---------|----------|
| drex_decide   | scalar        | NULL        | NULL    |          |
| prompt_drex   | scalar        | NULL        | NULL    |          |

### Overloaded Functions

<div class="extension_functions_table"></div>

This extension does not add any function overloads.

### Added Types

<div class="extension_types_table"></div>

This extension does not add any types.

### Added Settings

<div class="extension_settings_table"></div>

|         name         |                                                     description                                                     | input_type | scope  | aliases | typed_value |
|----------------------|---------------------------------------------------------------------------------------------------------------------|------------|--------|---------|-------------|
| drex_max_concurrency | Most Drex requests in flight at once across the database, unless a call passes concurrency :=                       | UBIGINT    | GLOBAL | []      | 8           |
| drex_max_rpm         | Most Drex requests sent per minute across the database: 0 (the default) for no limit; Drex's 429s pace each account | UBIGINT    | GLOBAL | []      | 0           |
| temp_directory       | Set the directory to which temporary files are written.                                                             | VARCHAR    | GLOBAL | []      | post.db.tmp |