SELECT d.datname AS Name,pg_catalog.pg_get_userbyid(d.datdba) AS Owner,CASE WHEN pg_catalog.has_database_privilege(d.datname,'CONNECT')
THEN pg_catalog.pg_size_pretty(pg_catalog.pg_database_size(d.datname))
ELSE 'No Access'
END AS SIZE
FROM pg_catalog.pg_database d
ORDER BY
CASE WHEN pg_catalog.has_database_privilege(d.datname,'CONNECT')
THEN pg_catalog.pg_database_size(d.datname)
ELSE NULL
END DESC -- nulls first
LIMIT 20
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