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Отоб­ра­зить спи­сок баз дан­ных по раз­ме­ру мож­но сле­ду­ю­щим запросом

SELECT pg_database.datname as "database_name", pg_database_size(pg_database.datname)/1024/1024 AS size_in_mb FROM pg_database ORDER by size_in_mb DESC;