Differences of SQL Vs No SQL ( RDBMS Vs No SQL )
RDBMS(Relational database management system) is also called as SQL engine  is the basic traditional system which is used for Application development.Data is stored in form of rows and columns in a table .

 RDBMS include Oracle , mysql ,  postgres

 No sql engine is used to deal with both structured and unstructured data . This kind of system is used for application development  ( Application development ) where the developer has no view of how the application is received by the users across the world where we cannot predict the traffic across the network which will help in scalable as per the need .

 NoSql Engines include Hbase , BigTable , Couch DB

 Below are the comparisons :
Parameter 
RDBMS
No SQL
Cost
Freeware 
Free ware 
Parallelism
No Enabled 
Enabled
IO Read and Writes
More 
Less
Scalability
Vertical Scalable
Hortizontal scalable
Maintanance 
More 
less
Schema Driven
Yes
No Schema
Join Mechanism ( Normalisation)
Normalised 
Denormalised
Ease of Use & UI 
Easy
Hard , No UI 
Type of processing 
Table 
Key Value Pai