Assuming all Snowflake accounts are using an Enterprise edition or higher, in which development and...

Developers create their own datasets to work against transformed versions of the live data.

Production and development run in different databases in the same account, and Developers need to see production-like data but with specific columns masked.

Data is in a production Snowflake account that needs to be provided to Developers in a separate development/testing Snowflake account in the same cloud region.

Developers create their own copies of a standard test database previously created for them in the development account, for their initial development and unit testing.

The release process requires pre-production testing of changes with data of production scale and complexity. For security reasons, pre-production also runs in the production account.