In a recent blog post, I've advocated against the use of COUNT(*) in SQL, when a simple EXISTS() would suffice. This is important stuff. I keep tuning productive queries where a customer runs a COUNT(*) query like so: SELECT count(*) INTO v_any_wahlbergs FROM actor a JOIN film_actor fa USING (actor_id) WHERE a.last_name = 'WAHLBERG' ... … Continue reading Don’t Even use COUNT(*) For Primary Key Existence Checks
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