Debugging Snowflake Queries

Debug Snowflake SQL systematically: reproduce the failure, classify the problem, isolate the smallest failing unit, verify grain and joins, and only then rewrite the query.

When to Use

• Diagnose Snowflake errors such as SQL compilation error, invalid identifier, object does not exist, ambiguous column, cast failures, permission failures, or timeouts
• Debug queries that run but return the wrong count, duplicate rows, empty results, stale-looking data, or impossible percentages
• Investigate performance problems such as long scans, warehouse issues, or unexpectedly expensive joins
• Review an ad hoc SQL query and explain how to make it correct and reproducible

Do Not Use For

• Template or application-layer SQL generation failures where no Snowflake SQL is actually being debugged
• General business investigations where the main task is answering the question rather than debugging the query itself

Workflow