why postgres using sec scan isntead of index - SERP Analysis

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https://medium.com/towardsdev/why-postgresql-uses-sequential-scan-even-if-index-exists-19b439bb7c7f

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https://www.postgresql.eu/events/fosdem2020/sessions/session/2863/slides/278/PostgreSQL%20Conf%20FODEM%202020%20-%20Deep%20Dive%20to%20PostgreSQL%20Indexes.pdf

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https://www.depesz.com/2013/05/19/explaining-the-unexplainable-part-4/

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