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Evidence

Evidence is an open source, code-based alternative to drag-and-drop BI tools. Build polished data products with just SQL and markdown.

Getting started​

Head over to their installation page and start with their template to get you started.

Authenticate to MotherDuck​

When using development, you can go manually through the UI, pick "settings". If you are running Evidence locally, typically at http://localhost:3000/settings.

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Then select 'DuckDB' as a connection type, and as the filename, use 'md:?motherduck_token=xxxx' where xxx is your access token. Finally as extension, select "No extension". Click on Save.

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In production, you can set some global environmements, you would have to set two environments variables:

  • EVIDENCE_DUCKDB_FILENAME='md:?motherduck_token=xxxx'
  • EVIDENCE_DATABASE=duckdb

Displaying some data through SQL and Markdown​

Once done, you can add a new page in the pages folder and add the following code blocks to stackoverflow.md file:

First, we simply add some Markdown headers.

---
title: Evidence & MotherDuck 
---

# Stories with most score

Then, we query our data from the HackerNews sample_data database in MotherDuck. The query is fetching the top stories (posts) from HackerNews.

​```​new_items
[object Object]
```

Finally, we use the reference of that query result new_items to create a list that would be generated in Mardown. The list contains the title (with the url of the story), the date, the score and the author of the story.

{#each new_items as item}

* [{item.title}](https://news.ycombinator.com/item?id={item.id}) {item.date} ⬆ {item.score} by [{item.by}](https://news.ycombinator.com/user?id={item.by}) 

{/each}

Head over then to this page you created and you should see the final result that looks like this:

img