title: why rdbms cant store unstructured data?and why nosql databases can?
body: <p>I have read that one of the differences between rdbms and nosql databases is storing unstructured data,I know each nosql database has its own architecture and algorithms,but I want to know why rdbms cant store unstructured data?</p>
  
  <p>and why nosql databases can do that,I will be really thankful if you show me a simple example so that I can understand how nosql databases do that,and what makes rdbms unable to store unstructured data. </p>