SQL Reporting Skill

Apply this skill before writing or running any analytics SQL so reports stay consistent and safe.

When to Use This Skill

Use this skill when the task involves:

• Querying warehouse tables for a metric, report, or dashboard figure
• Aggregating rows (counts, sums, rolling windows)
• Cross-referencing two or more tables

Conventions

1. Always SELECT explicit column names, never SELECT *.
2. Filter on a partition/date column first to bound the scan.
3. Alias aggregates with snake_case names (order_count, not count(*)).
4. Cap exploratory queries with LIMIT unless an aggregate already collapses the result set.
5. Prefer COUNT(DISTINCT ...) over a sub-query when de-duplicating.

Review Checklist (run before returning an answer)

• No SELECT *.
• A date or partition predicate is present.
• Every aggregate has an explicit alias.
• The query reads only from tables the task actually needs.

Output Format

Return the final SQL in a fenced ```sql block, then one sentence describing what the query returns.