View the size of each table in Postgresql

I don't know which great god wrote it, because when I read it from someone else's blog, others also indicated that they forgot which great god wrote it. So, sorry to the original author, can't write the source.

SELECT
schemaname as schema,
tablename as table_name,
pg_size_pretty(pg_relation_size(schemaname || '.' || tablename)) AS size_p,
pg_total_relation_size(schemaname || '.' || tablename) AS siz,
pg_size_pretty(pg_total_relation_size(schemaname || '.' || tablename)) AS total table size,
pg_total_relation_size(schemaname || '.' || tablename) - pg_relation_size(schemaname || '.' || tablename) AS 索引大小,
(100*(pg_total_relation_size(schemaname || '.' || tablename) - pg_relation_size(schemaname || '.' || tablename)))/CASE WHEN pg_total_relation_size(schemaname || '.' || tablename) = 0 THEN 1 ELSE pg_total_relation_size(schemaname || '.' || tablename) END || '%' AS index_pct
FROM pg_tables
ORDER BY siz DESC

The following is the SQL execution result: