diff --git a/cheat/postgresql.md b/cheat/postgresql.md
index 0ebc3b9..9894935 100644
--- a/cheat/postgresql.md
+++ b/cheat/postgresql.md
@@ -54,3 +54,9 @@
 
 If you're using CLI and you're a postgres user, then you can do this:
 `psql -c "SELECT version();"`
+
+### Creating a copy of a database in PostgreSQL.
+```
+pg_dumpall > db.out # backup
+psql -f db.out postgres # restore (might requires some DROP DATABASE xxx if you do want to replace existing data with same db and table names.
+```