Introduction
MotherDuck is a serverless analytics service built on DuckDB. It hosts DuckDB databases in the cloud and keeps the same SQL surface you'd use locally. PostgreSQL is what most apps run on for transactional data.
So you usually want both: Postgres for the app, MotherDuck for analytics. The part in the middle that copies tables across is what Sling does.
This guide replicates a PostgreSQL schema into MotherDuck with Sling, in both full-refresh and incremental modes. The CLI output and row counts below come from an actual run, not a fabricated one.
Installing Sling
