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Motherduck duckdb sql

Skill motherduckdb/agent-skills/plugins/motherduck-skills-claude/skills/motherduck-duckdb-sql

Opinionated AI agent skills for building applications with MotherDuck

Install
npx -y skills add motherduckdb/agent-skills --skill motherduck-duckdb-sql

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DuckDB SQL reference for MotherDuck. Use when you need exact DuckDB syntax or function behavior, friendly SQL features like QUALIFY, GROUP BY ALL, or list/struct types, MotherDuck-specific SQL such as shares, secrets, snapshots, or UNDROP, or to fix SQL errors and PostgreSQL-style SQL that fails on MotherDuck.

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SKILL.md

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DuckDB SQL Reference for MotherDuck

Use this skill when you need exact DuckDB syntax, function behavior, or a quick sanity check that a statement will actually work on MotherDuck.

Source Of Truth

  • Prefer current DuckDB SQL docs for language features and function semantics.
  • Use current MotherDuck SQL docs for MotherDuck-only commands such as shares, secrets, snapshots, and Dive operations.
  • MotherDuck can lag upstream DuckDB releases for client compatibility; check MotherDuck version-lifecycle docs before promising newly released DuckDB syntax or types are available.
  • If the connection path matters, verify behavior against the current Postgres-endpoint docs before promising server-mode support.

Default Posture

  • Write DuckDB SQL, not PostgreSQL SQL, even when the client connects through the Postgres endpoint.
  • Use fully qualified "database"."schema"."table" names once more than one database or share is in scope.
  • Prefer DuckDB-native constructs when they simplify the query: GROUP BY ALL, QUALIFY, UNION BY NAME, arg_max, EXCLUDE, and REPLACE.
  • When porting SQL from another engine, translate functions, date arithmetic, identifier quoting, and type casts explicitly instead of assuming compatibility.
  • Verify current MotherDuck support before relying on recently released upstream DuckDB features such as VARIANT, native GEOMETRY, MERGE INTO, or date_trunc return-type changes.
  • Check whether the statement depends on local files, extension install/load, temporary-table behavior, or other client-only features before claiming it will work in MotherDuck.
  • Treat snapshot, restore, and UNDROP DATABASE statements as operational SQL with plan-specific retention behavior, not ordinary analytical syntax.
  • Treat MotherDuck SQL as an additional surface on top of DuckDB SQL, not a replacement for it.

Workflow

  1. Confirm the connection path and whether the question is about syntax, feature support, or a specific error.
  2. Write or repair the statement in DuckDB SQL first.
  3. Verify any MotherDuck-only command or server-mode limitation against the current docs.
  4. If the user needs exact syntax or function details, open references/SYNTAX_REFERENCE.md.

Open Next

  • Read references/SYNTAX_REFERENCE.md for DuckDB data types, friendly SQL features, functions, complex types, and common MotherDuck-specific gotchas.

Related Skills

  • motherduck-query for writing and validating analytical SQL against live MotherDuck data
  • motherduck-connect when syntax support depends on PG endpoint versus native DuckDB behavior
  • motherduck-explore when the problem is really missing schema context rather than missing syntax knowledge

Keep looking

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