Redshift Script

Hi I am using a script to get details about database name, schema name, table name, row count and size of each table in GB. I would like to add one extra column '% of Disk Utilization' to the table which will calculate the percentage of size utilized by each table. This should be like % of Disk Utilization = [(Size of each table)/(Total size of all tables)]*100Also, this column values should be sorted out in descending order.Can any one help me out please.Here is the script that needs to be edited.SELECT db_name ,schema_name ,table_name ,row_count ,size_in_gb FROM (SELECT id table_id ,datname db_name ,nspname schema_name ,relname table_name ,SUM(rows) row_count FROM stv_tbl_perm JOIN pg_class ON pg_class.oid = stv_tbl_perm.id JOIN pg_namespace ON pg_namespace.oid = relnamespace JOIN pg_database ON pg_database.oid = stv_tbl_perm.db_id GROUP BY id, datname, nspname, relname ORDER BY id, datname, nspname, relname) tbl_det JOIN (SELECT tbl table_id ,ROUND(CONVERT(REAL,COUNT(*))/1024,2) size_in_gb FROM stv_blocklist bloc GROUP BY tbl) tbl_size ON tbl_size.table_id = tbl_det.table_id ;