diff --git a/README.md b/README.md
index e28d8bc..7cf8632 100644
--- a/README.md
+++ b/README.md
@@ -45,4 +45,14 @@ mvn liquibase:update -X > liquibase_log/liquibase_log_update-$(date +%Y%m%d%H%M%
 mvn liquibase:history > liquibase_log/liquibase_log_history-$(date +%Y%m%d%H%M%S).log
 ```
 
-
+```sql
+DO $$ DECLARE
+r RECORD;
+BEGIN
+FOR r IN (SELECT tablename FROM pg_tables WHERE schemaname =
+'public') LOOP
+EXECUTE 'DROP TABLE IF EXISTS ' || quote_ident(r.tablename) || '
+CASCADE';
+END LOOP;
+END $$;
+```
\ No newline at end of file