==SQL and relational DBMS== 
 I found that you are trying to move/split list/comparison of RDBMS to SQL DBMS. I'm not sure if it is good or not. I know SQL is just one of the implementation of RDBMS (or in some cases SQL is not relational because it violates some of the relational rules). But SQL implementation is the most well-known and practial implementation of RDBMS. So I don't see the benefit. 

 Also, SQL is used for not only RDBMS, but also ORDBMS. See also comparision of object-relation database management systems and list of object-relation database management systems. If you are moving, please take care of them as well (ORDBMS is RDBMS, but RDBMS is not necessary ORDBMS). If you are not sure how, I suggest reverting them for a moment.