motherduck-duckdb-sql

To rewrite PostgreSQL SQL for MotherDuck, you must translate Postgres-specific functions and syntax into DuckDB-native constructs, validating identifier rules and MotherDuck-only features to ensure correct execution.

Your PostgreSQL query fails on MotherDuck because DuckDB has different syntax and function semantics, requiring DuckDB-native constructs and validation of MotherDuck server-mode limitations to resolve errors.

MotherDuck does not support all standard DuckDB features identically, because it applies server-mode limitations and version-lifecycle constraints that require checking connection paths before relying on newer upstream DuckDB capabilities.

DuckDB core SQL handles standard data querying and analytics, while MotherDuck operational commands manage platform-specific capabilities, requiring you to distinguish between them to avoid executing unsupported server-mode statements.

You cannot always use newer DuckDB features on MotherDuck immediately, because MotherDuck's version lifecycle and connection-path behavior require validation before relying on recently introduced upstream DuckDB syntax.

To debug SQL syntax errors on MotherDuck via a Postgres endpoint, you must check for PostgreSQL-to-DuckDB incompatibilities and apply DuckDB-native identifier rules and constructs instead of assuming Postgres compatibility.