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Snowflake ER Diagram: Reverse Engineer Tables Into a Diagram

Turn a Snowflake schema into an editable ER diagram without sending your warehouse design to a hosted diagramming service.

6 min read · Free, no sign-up · Updated 2026-09-05

Snowflake schemas are easy to query and hard to explain visually once there are dozens of tables. A Snowflake ER diagram gives engineers, analysts and reviewers a shared map: what tables exist, which columns identify records, and how the important relationships fit together.

FlowDiagram includes a Snowflake workflow for browsing databases and schemas, selecting tables, importing columns and constraints, and editing the resulting diagram in the browser.

Importing from Snowflake

1. Open FlowDiagram and choose Import → Snowflake.
2. Connect using the configured account, role and warehouse.
3. Pick a database and schema, then select the tables to diagram.
4. Import them as entity tables with relationships where metadata is available.

Why browser-only matters

Warehouse diagrams often reveal customer, finance or operational data structures. FlowDiagram keeps the diagram local, and Snowflake access tokens are kept in session storage rather than saved into the document.

Exporting changes

After review, export Snowflake DDL from the diagram. FlowDiagram defaults toward safer output such as CREATE TABLE IF NOT EXISTS for deploy-style workflows, so the diagram can help bridge documentation and implementation.

Frequently asked questions

Can FlowDiagram connect to Snowflake?

Yes, from the browser using public OAuth / PKCE or through an internal gateway that returns the required CORS headers.

Are Snowflake tokens stored in exported diagrams?

No. Tokens live in session storage, not local storage, and are not packed into saved or shared diagrams.

Can I export Snowflake DDL?

Yes. FlowDiagram can export Snowflake-flavoured CREATE TABLE statements from entity tables.