Add Create Database Uses Template1 as a postgres til

postgres/create-database-uses-template1.md

@@ -0,0 +1,30 @@
+# Create Database Uses Template1
+
+Whenever you use the [`create
+database`](https://www.postgresql.org/docs/current/sql-createdatabase.html)
+query, unless otherwise specified, it will create it by cloning `template1` by
+default.
+
+You can view, inspect, and even modify this database template by connecting to
+it.
+
+```sql
+\c template1
+```
+
+Every Postgres cluster starts with two templates.
+
+```sql
+select datname from pg_database where datistemplate = true;
+  datname
+-----------
+ template1
+ template0
+(2 rows)
+```
+
+You cannot however connect to and modify `template0`. It is a fallback clone of
+`template1` that you can utilize if you ever modify `template1` and need to
+restore it.
+
+[source](https://supabase.io/blog/2020/07/09/postgresql-templates/)