SELECT
    current_database(), schemaname, tablename, 
    ROUND((CASE WHEN otta=0 THEN 0.0 ELSE sml.relpages::float/otta END)::numeric,1) AS tbloat,
    CASE WHEN relpages < otta THEN 0 ELSE bs*(sml.relpages-otta)::BIGINT END AS wastedbytes,
    iname, 
    ROUND((CASE WHEN iotta=0 OR ipages=0 THEN 0.0 ELSE ipages::float/iotta END)::numeric,1) AS ibloat,
    CASE WHEN ipages < iotta THEN 0 ELSE bs*(ipages-iotta) END AS wastedibytes
  FROM (
    SELECT
      schemaname, tablename, cc.reltuples, cc.relpages, bs,
      CEIL((cc.reltuples*((datahdr+ma-
        (CASE WHEN datahdr%ma=0 THEN ma ELSE datahdr%ma END))+nullhdr2+4))/(bs-20::float)) AS otta,
      COALESCE(c2.relname,'?') AS iname, COALESCE(c2.reltuples,0) AS ituples, COALESCE(c2.relpages,0) AS ipages,
      COALESCE(CEIL((c2.reltuples*(datahdr-12))/(bs-20::float)),0) AS iotta 
    FROM (
      SELECT
        ma,bs,schemaname,tablename,
        (datawidth+(hdr+ma-(case when hdr%ma=0 THEN ma ELSE hdr%ma END)))::numeric AS datahdr,
        (maxfracsum*(nullhdr+ma-(case when nullhdr%ma=0 THEN ma ELSE nullhdr%ma END))) AS nullhdr2
      FROM (
        SELECT
          schemaname, tablename, hdr, ma, bs,
          SUM((1-null_frac)*avg_width) AS datawidth,
          MAX(null_frac) AS maxfracsum,
          hdr+(
            SELECT 1+count(*)/8
            FROM pg_stats s2
            WHERE null_frac<>0 AND s2.schemaname = s.schemaname AND s2.tablename = s.tablename
          ) AS nullhdr
        FROM pg_stats s, (
          SELECT
            (SELECT current_setting('block_size')::numeric) AS bs,
            CASE WHEN substring(v,12,3) IN ('8.0','8.1','8.2') THEN 27 ELSE 23 END AS hdr,
            CASE WHEN v ~ 'mingw32' THEN 8 ELSE 4 END AS ma
          FROM (SELECT version() AS v) AS foo
        ) AS constants
        GROUP BY 1,2,3,4,5
      ) AS foo
    ) AS rs
    JOIN pg_class cc ON cc.relname = rs.tablename
    JOIN pg_namespace nn ON cc.relnamespace = nn.oid AND nn.nspname = rs.schemaname AND nn.nspname <> 'information_schema' AND nn.nspname <> 'pg_catalog'
    LEFT JOIN pg_index i ON indrelid = cc.oid
    LEFT JOIN pg_class c2 ON c2.oid = i.indexrelid
  ) AS sml
ORDER BY wastedbytes DESC;