diff --git a/pg/du.sql b/pg/du.sql
new file mode 100644
index 0000000..55a7c58
--- /dev/null
+++ b/pg/du.sql
@@ -0,0 +1,10 @@
+SELECT nspname || '.' || relname AS "relation",
+    pg_size_pretty(pg_total_relation_size(C.oid)) AS "total_size"
+  FROM pg_class C
+  LEFT JOIN pg_namespace N ON (N.oid = C.relnamespace)
+  WHERE nspname NOT IN ('pg_catalog', 'information_schema')
+    AND C.relkind <> 'i'
+    AND nspname !~ '^pg_toast'
+  ORDER BY pg_total_relation_size(C.oid) DESC
+  LIMIT 20;
+