JSON

JavaScript Object Notation (JSON)

• Serializing data objects
• Human-readable
• Data Interchange
• Representing and storing semistructured data

• Number, String, Boolean, etc

• Sets of label-value pairs (key-value pairs)

• List of values

         "id":"01",
         "language": "Java",
         "edition": "third",
         "author": "Herbert Schildt"

　　　　　　"id":"07",
　　　　　　"language": "C++",
　　　　　　"edition": "second",
　　　　　　"author": "E.Balagurusamy"

Relational VS JSON

Relational JSON

• Collection of Tables

• Fixed Schema

• Simple expressive language

• Mature native systems

JSON

• Collection of Nested Sets and Arrays
• Schema not required in advance
• Not as simple
• Coupled with programming languages
  • Used in NOSQL systems anddoc-oriented DBMS

JSON and PostgreSQL

Selecting

Filtering

Aggregation

CS3402 Lecture 3