From 098f690c47d30bc8110fa11116020dc15fc2c80b Mon Sep 17 00:00:00 2001
From: jbranchaud <jbranchaud@gmail.com>
Date: Thu, 14 Jan 2021 15:12:46 -0600
Subject: [PATCH] Add Generate Random UUIDs Without An Extension as a postgres
 til

---
 README.md                                     |  3 ++-
 ...erate-random-uuids-without-an-extension.md | 20 +++++++++++++++++++
 2 files changed, 22 insertions(+), 1 deletion(-)
 create mode 100644 postgres/generate-random-uuids-without-an-extension.md

diff --git a/README.md b/README.md
index 9619781..6f05626 100644
--- a/README.md
+++ b/README.md
@@ -10,7 +10,7 @@ pairing with smart people at Hashrocket.
 
 For a steady stream of TILs, [sign up for my newsletter](https://tinyletter.com/jbranchaud).
 
-_1008 TILs and counting..._
+_1009 TILs and counting..._
 
 ---
 
@@ -521,6 +521,7 @@ _1008 TILs and counting..._
 - [Find The Location Of Postgres Config Files](postgres/find-the-location-of-postgres-config-files.md)
 - [Fizzbuzz With Common Table Expressions](postgres/fizzbuzz-with-common-table-expressions.md)
 - [Generate A UUID](postgres/generate-a-uuid.md)
+- [Generate Random UUIDs Without An Extension](postgres/generate-random-uuids-without-an-extension.md)
 - [Generate Series Of Numbers](postgres/generate-series-of-numbers.md)
 - [Generating UUIDs With pgcrypto](postgres/generating-uuids-with-pgcrypto.md)
 - [Get The Size Of A Database](postgres/get-the-size-of-a-database.md)
diff --git a/postgres/generate-random-uuids-without-an-extension.md b/postgres/generate-random-uuids-without-an-extension.md
new file mode 100644
index 0000000..cc5c786
--- /dev/null
+++ b/postgres/generate-random-uuids-without-an-extension.md
@@ -0,0 +1,20 @@
+# Generate Random UUIDs Without An Extension
+
+In other posts I've covered how to generate v4 random UUIDs in PostgreSQL
+[using the `uuid-ossp` extension](generate-a-uuid.md) as well as the more
+up-to-date method of [using the `pgcrypto`
+extension](generating-uuids-with-pgcrypto.md).
+
+As of PostgreSQL v13, you no longer need to add an extension for v4 UUID
+generation. It comes built-in as the `gen_random_uuid()` function.
+
+```sql
+> select gen_random_uuid();
+           gen_random_uuid
+--------------------------------------
+ 0aa72fe6-ede7-4ccf-b328-348becc58066
+(1 row)
+```
+
+If you need other non-v4 UUID functions, you'll have to stick with
+[uuid-ossp](https://www.postgresql.org/docs/current/uuid-ossp.html).