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Funnel Conversion in SQL, and the Step That Shows 100%

By Michael Nocito , data analyst · Published August 8, 2026 By the end of this page you can turn a table of events into a funnel in one query, work out what fraction of people get from each step to the next, tell the difference between a step people pass and a step people skip, and produce the one summary a funnel is actually for: where everybody stops. It is about twenty-five minutes, and every…

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When to Index a Table: A Practical Guide for Analysts

By Michael Nocito , data analyst · Published August 8, 2026 By the end of this page you can tell whether a query is reading your whole table or jumping straight to what it needs, add an index that…

  • Indexes improve database performance by allowing direct data access
  • Indexes are sorted copies of table columns, enabling quick row location
  • Indexes benefit queries filtering/sorting by indexed columns, not unrelated columns

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