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Find largest tables in Postgres

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  1. SELECT nspname || '.' || relname AS "relation",
  2.     pg_size_pretty(pg_total_relation_size(C.oid)) AS "total_size"
  3.   FROM pg_class C
  4.   LEFT JOIN pg_namespace N ON (N.oid = C.relnamespace)
  5.   WHERE nspname NOT IN ('pg_catalog', 'information_schema')
  6.     AND C.relkind <> 'i'
  7.     AND nspname !~ '^pg_toast'
  8.   ORDER BY pg_total_relation_size(C.oid) DESC
  9.   LIMIT 20;

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