Better indent the SQL

db/migrate/20170622135451_rename_duplicated_variable_key.rb

@@ -7,10 +7,13 @@ class RenameDuplicatedVariableKey < ActiveRecord::Migration
 
   def up
     execute(<<~SQL)
-      UPDATE ci_variables SET #{key} = CONCAT(#{key}, #{underscore}, id)
+      UPDATE ci_variables
+        SET #{key} = CONCAT(#{key}, #{underscore}, id)
         WHERE id IN (
-          SELECT * FROM ( -- MySQL requires an extra layer
-            SELECT dup.id FROM ci_variables dup
+          SELECT *
+            FROM ( -- MySQL requires an extra layer
+              SELECT dup.id
+                FROM ci_variables dup
                 INNER JOIN (SELECT max(id) AS id, #{key}, project_id
                               FROM ci_variables tmp
                               GROUP BY #{key}, project_id) var