From 00a69a4f1702297ec82efe0dc96baaac22fa28a7 Mon Sep 17 00:00:00 2001
From: jbranchaud <jbranchaud@gmail.com>
Date: Tue, 20 Oct 2015 08:44:24 -0500
Subject: [PATCH] Add Generate A UUID as a postgres til.

---
 README.md                   |  1 +
 postgres/generate-a-uuid.md | 19 +++++++++++++++++++
 2 files changed, 20 insertions(+)
 create mode 100644 postgres/generate-a-uuid.md

diff --git a/README.md b/README.md
index dd971bf..ff792b3 100644
--- a/README.md
+++ b/README.md
@@ -108,6 +108,7 @@ smart people at [Hashrocket](http://hashrocket.com/).
 - [Edit Existing Functions](postgres/edit-existing-functions.md)
 - [Extracting Nested JSON Data](postgres/extracting-nested-json-data.md)
 - [Fizzbuzz With Common Table Expressions](postgres/fizzbuzz-with-common-table-expressions.md)
+- [Generate A UUID](postgres/generate-a-uuid.md)
 - [Generate Series Of Numbers](postgres/generate-series-of-numbers.md)
 - [Getting A Slice Of An Array](postgres/getting-a-slice-of-an-array.md)
 - [Integers In Postgres](postgres/integers-in-postgres.md)
diff --git a/postgres/generate-a-uuid.md b/postgres/generate-a-uuid.md
new file mode 100644
index 0000000..32b742f
--- /dev/null
+++ b/postgres/generate-a-uuid.md
@@ -0,0 +1,19 @@
+# Generate A UUID
+
+Postgres has support for universally unique identifiers (UUIDs) as a column
+data type via `uuid`. If you have a UUID column, you may need to generate a
+UUID.  This requires the `uuid-ossp` module. This module provides a number
+of functions for generating UUIDs including the `uuid_generate_v4()`
+function which bases the UUID entirely off random numbers.
+
+```sql
+> create extension "uuid-ossp";
+CREATE EXTENSION
+> select uuid_generate_v4();
+           uuid_generate_v4
+--------------------------------------
+ a0eebc99-9c0b-4ef8-bb6d-6bb9bd380a11
+```
+
+See the [postgres docs](http://www.postgresql.org/docs/9.4/static/uuid-ossp.html) for more
+details on UUID generation functions.