Principles of Database Systems: comparison of SQL and NoSQL

• The difference between SQL and NoSQL

  SQL	NoSQL
  Using the relational table to store data, the data patterns having strict constraints, thus difficult to store data error	To store key documents using JSON-formatted information, more flexible, but it can also lead to data inconsistency problem occurs
  You need to define the schema of the table before using the table	No specific pattern data stored
  Use standardization to reduce data redundancy	Use of non-standard storage standardized information to ensure that all information in a document that contains one entry
  JOIN operation support, relevant data using a SQL statement taken from more than one table	JOIN operation is not supported
  Meet the data integrity constraints	Does not satisfy the integrity constraints, do not allow data validation can be stored to an arbitrary position
  Need to customize transactions to ensure data consistency	Transactional operations includes a single document, the document does not have a plurality of operating a transactional
  SQL language	Use JSON class
  Easy to maintain but poor scalability	Good scalability