PostgreSQL获取表的Size

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sql文1：

SELECT relname,reltuples,(relpages / 128) as mbytes,(relpages * 8192.0 / (reltuples + 1e-10)) as average_row_size FROM pg_class ORDER BY mbytes DESc;

sql文2：

SELECT pgn.nspname,relname,pg_size_pretty(relpages::bigint * 8 * 1024) AS size,CASE WHEN relkind = 
't' THEN (SELECT pgd.relname FROM pg_class pgd WHERE pgd.reltoastrelID = pg.oID) WHEN nspname = 
'pg_toast' AND relkind = 'i' THEN (SELECT pgt.relname FROM pg_class pgt WHERE SUBStriNG(pgt.relname 
FROM 10) = replaCE(SUBStriNG(pg.relname FROM 10),'_index','')) ELSE (SELECT pgc.relname FROM 
pg_class pgc WHERE pg.reltoastrelID = pgc.oID) END::varchar AS refrelname,CASE WHEN nspname = 
'pg_toast' AND relkind = 'i' THEN (SELECT pgts.relname FROM pg_class pgts WHERE pgts.reltoastrelID = 
(SELECT pgt.oID FROM pg_class pgt WHERE SUBStriNG(pgt.relname FROM 10) = replaCE(SUBStriNG(pg.relname 
FROM 10),''))) END AS relIDxrefrelname,relfilenode,relkind,reltuples::bigint,relpages 
FROM pg_class pg,pg_namespace pgn WHERE pg.relnamespace = pgn.oID AND pgn.nspname NOT IN 
('information_scheR_503_11845@a','pg_catalog') ORDER BY relpages DESc;

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