A programmatic approach to evaluate all the alternatives available in modern databases to speed up COUNT(DISTINCT) queries

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This post provides various methods to speed up COUNT(DISTINCT) SQL queries. It explains the difference between COUNT(*) and COUNT(field), suggests using database estimates, aggregations, covering indexes, materialized views, and HyperLogLog data structures to improve performance.

How to speed up COUNT(DISTINCT)

COUNT(*) vs COUNT(field) vs COUNT(DISTINCT field)

How to programmatically approach a slow COUNT(DISTINCT) query