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Postgresql – Postgres Index to speed up LEFT OUTER JOIN

Within my db I have table prediction_fsd with about 5 million entries. The site table contains approx 3 million entries. I need to execute queries that look like SELECT prediction_fsd.id AS prediction_fsd_id, prediction_fsd.site_id AS prediction_fsd_site_id, prediction_fsd.html_hash AS prediction_fsd_html_hash, prediction_fsd.prediction AS…

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