Is NoSQL really necessary or do we just need a better SQL?

ACID   The  ACID  principle  states  that  a  transac?on  is   •  durable   •  consistent  (constraints  are  always  sa?sfied)   •  atomic   •  isolated   Note  that  "consistent"  has  a  very  different  meaning  from  the   consistency  in  the  CAP  theorem.  Consistency  in  ACID  is  all  about   constrains,  consistency  in  the  CAP  theorem  is  all  about   distributed  nodes.