Add Creating Indexes With Ecto as an elixir til

README.md

@@ -7,7 +7,7 @@ variety of languages and technologies. These are things that don't really
 warrant a full blog post. These are mostly things I learn by pairing with
 smart people at [Hashrocket](http://hashrocket.com/).
 
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+_495 TILs and counting..._
 
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 - [Binary Representation Of A String](elixir/binary-representation-of-a-string.md)
 - [Check For A Substring Match](elixir/check-for-a-substring-match.md)
 - [Create A Date With The Date Sigil](elixir/create-a-date-with-the-date-sigil.md)
+- [Creating Indexes With Ecto](elixir/creating-indexes-with-ecto.md)
 - [Determine The Latest Release Of A Hex Package](elixir/determine-the-latest-release-of-a-hex-package.md)
 - [Do You Have The Time?](elixir/do-you-have-the-time.md)
 - [Do You Have The Time? - Part 2](elixir/do-you-have-the-time-part-2.md)

elixir/creating-indexes-with-ecto.md

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+# Creating Indexes With Ecto
+
+Using indexes in the right places within relational databases is a great way
+to speed up queries and ensure data integrity.
+
+To add a basic index in an Ecto migration, use `Ecto.Migration.index\2`:
+
+```elixir
+create index(:users, [:email])
+```
+
+Creating a composite index doesn't require jumping through any hoops; just
+put the relevant column names in the list:
+
+```elixir
+create index(:posts, [:user_id, :title])
+```
+
+See `h Ecto.Migration.index` for more details.