Create a concrete commitment to inspect NULL and join survival before sharing SQL.
A query with LEFT JOIN, NOT IN, COUNT(column), or a nullable field in WHERE that affects a metric or export. When I see LEFT JOIN, NOT IN, or COUNT(column), I will run a survival check: base row count, post-join row count, NULL-match count, and final filtered row count. I will paste the four numbers into the review note. In 3 days, check whether you used the drafted SQL action and whether it changed the query result, review comment, or metric confidence. A dashboard query using COUNT, SUM, or GROUP BY that others rely on this week. A JOIN you are…
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