Add Duplicate A Local Database as a postgres til

README.md

@@ -9,7 +9,7 @@ and pairing with smart people at Hashrocket.
 
 For a steady stream of TILs, [sign up for my newsletter](https://tinyletter.com/jbranchaud).
 
-_914 TILs and counting..._
+_915 TILs and counting..._
 
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@@ -446,6 +446,7 @@ _914 TILs and counting..._
 - [Determining The Age Of Things](postgres/determining-the-age-of-things.md)
 - [Difference Between Explain And Explain Analyze](postgres/difference-between-explain-and-explain-analyze.md)
 - [Dump And Restore A Database](postgres/dump-and-restore-a-database.md)
+- [Duplicate A Local Database](postgres/duplicate-a-local-database.md)
 - [Edit Existing Functions](postgres/edit-existing-functions.md)
 - [Escaping A Quote In A String](postgres/escaping-a-quote-in-a-string.md)
 - [Escaping String Literals With Dollar Quoting](postgres/escaping-string-literals-with-dollar-quoting.md)

postgres/duplicate-a-local-database.md

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+# Duplicate A Local Database
+
+You can quickly create a new database instance that is a duplicate of another
+database. If the existing database is local, you don't need to dump and
+restore. Instead you can use the `createdb` command that comes with Postgres:
+
+```bash
+$ createdb -O ownername -T originaldb newdb
+```
+
+This creates a new database called `newdb` using `originaldb` as a template
+(`-T`). This will include the entire schema and data of the original database.
+The `-O` flag allows you to specify the owner of the database. Since this is
+local, you probably want your primary unix user as the owner.
+
+[source](https://stackoverflow.com/a/6739995/535590)