No resources for Null is special

Author: arialdomartini

README.md

@@ -463,8 +463,7 @@ In web development, Model-View Controller and Model-View-View-Model approaches a
 How would you migrate an application from a database to another, for example from MySQL to PostgreSQL? If you had to manage that project, which issues would you expect to face?
 
 #### NULL is special
-Why do databases treat null as a so special case? For example, why does ```SELECT * FROM table WHERE field = null``` not match records with null ``field`` in SQL?<br/>
-[Resources](databases/null-is-special.md)
+Why do databases treat null as a so special case? For example, why does ```SELECT * FROM table WHERE field = null``` not match records with null ``field`` in SQL?
 
 #### ACID
 ACID is an acronym that refers to Atomicity, Consistency, Isolation and Durability, 4 properties guaranteed by a database transaction in most database engines. What do you know about this topic? Would you like to elaborate?<br/>