# Query Google Sheets/CSV data with PostgreSQL: n8n workflow

> Started by an event in a connected app, and works across Google Sheets and Postgres. It hands the judgement calls to Gemini.

Source: https://millionrounds.com/workflow/query-google-sheets-csv-data-with-postgresql (Millionrounds; every figure on the page links to its filing or article)

[Automation library](https://millionrounds.com/workflows) · [Content](https://millionrounds.com/workflows?category=Content#library)

# Query Google Sheets/CSV data with PostgreSQL

Started by an event in a connected app, and works across Google Sheets and Postgres. It hands the judgement calls to Gemini. 20 steps, 1 branch: a working afternoon to understand properly.

Medium Calls a model: Gemini

[Download free](https://millionrounds.com/login?next=%2Fapp%2Fworkflow%2Fquery-google-sheets-csv-data-with-postgresql)

**20 steps** Medium: a working afternoon

**1** Branch: places the flow splits

**0** Loops or waits

**2** Services it connects to

## The flow

Starts it 3 Model 4 Logic 6 Service 7

The steps in the order they run, from what starts it.

- 1 **Google Drive Trigger** Google Drive trigger *Starts it*
- 2 **execute_query_tool** Tool Workflow *Model*
- 3 **Google Gemini Chat Model** Lm Chat Google Gemini *Model*
- 4 **get_postgres_schema** Tool Workflow *Model*
- 5 **Execute Workflow Trigger** Execute Workflow trigger *Starts it*
- 6 **When chat message received** Manual Chat trigger *Starts it*
- 7 **change_this** Set *Logic*
- 8 **AI Agent With SQL Query Prompt** Agent *Model*
- 9 **sql query executor** Postgres *Service*
- 10 **schema finder** Postgres *Service*
- 11 **table exists?** Postgres *Service*
- 12 **response output** Set *Logic*
- 13 **schema to string** Code *Logic*
- 14 **fetch sheet data** Google Sheets *Service*
- 15 **is not in database** If *Logic*
- 16 **create table query** Code *Logic*
- 17 **remove table** Postgres *Service*
- 18 **create table** Postgres *Service*
- 19 **create insertion query** Code *Logic*
- 20 **perform insertion** Postgres *Service*

## How it's built

- **Starts on:** An event in a connected app
- **Steps:** 20, with 1 branch
- **Size:** Medium: a working afternoon
- **Connects to:** Google Sheets, Postgres
- **Model:** Gemini

## Questions

What does it need to run?

An n8n account, plus your own Google Sheets and Postgres accounts, and a key for Gemini. You connect your own accounts after importing it; none are included.

What starts it?

It starts on an event in a connected app.

Does it use AI?

Yes. It calls Gemini. Model calls are billed by the provider, not by n8n.

How long does it take to set up?

Plan an afternoon. 20 steps is enough that you should read each one before running it.

How do I import it?

Copy the workflow, open a new workflow in n8n and paste. The steps appear on the canvas, ready for your own accounts.

**Before you run it**

Nothing here has been tested by us. It is somebody's working automation, read and described from its own steps. Treat the connections it wants as a list of accounts it will touch, and read the 20 steps before you point it at anything that matters.

## Run it in n8n

- **Create your n8n account** Free to start. n8n is where the workflow runs. [Create an n8n account ↗](https://millionrounds.com/n8n)
- **Download the workflow** Free with a Millionrounds account. [Download free](https://millionrounds.com/login?next=%2Fapp%2Fworkflow%2Fquery-google-sheets-csv-data-with-postgresql)
- **Paste it into n8n** Open a new workflow in n8n and paste. Then connect your own accounts.

Stored with the author's traces removed: canvas notes, instance identifiers, saved credential names and any live document they had left behind.

## Connects to

Each opens the other workflows that use it.

[Google Sheets](https://millionrounds.com/workflows?service=Google+Sheets#library)[Postgres](https://millionrounds.com/workflows?service=Postgres#library)

## Workflows like it

Also content, with the same services where possible, closest in size first.

- [**AI Content Writer - Telegram to WordPress with Gemini** 20 steps · calls a model · Google Sheets, Telegram](https://millionrounds.com/workflow/ai-content-writer-telegram-to-wordpress-with-gemini)
- [**Analyze Meta Ad Library Video Ads with Gemini** 20 steps · calls a model · Google Sheets](https://millionrounds.com/workflow/analyze-meta-ad-library-video-ads-with-gemini)
- [**Auto-generate SEO product titles & descriptions with OpenAI** 20 steps · calls a model · Google Sheets](https://millionrounds.com/workflow/auto-generate-seo-product-titles-and-descriptions-with-opena)
- [**Automated blog publishing with Google Trends and OpenAI** 20 steps · calls a model · Google Sheets, WordPress](https://millionrounds.com/workflow/automated-blog-publishing-with-google-trends-and-openai)
- [**Convert audio emails to Japanese transcripts with OpenAI** 20 steps · calls a model · Gmail, Google Drive](https://millionrounds.com/workflow/convert-audio-emails-to-japanese-transcripts-with-openai)
- [**Generate & publish AI videos with Sora 2 and Veo 3.1** 20 steps · calls a model · Gmail, Google Sheets](https://millionrounds.com/workflow/generate-and-publish-ai-videos-with-sora-2-and-veo-3-1)