human: Given a node-centered hypergraph: <hypergraph>, where nodes represent authors and hyperedges represent groups of authors who co-authored the same paper.

Details of the hypergraph:
Center node: "Query by example"
  Abstract: In the last few years we have witnessed a trend to appeal to the non-professional user who has little or virtually no computer or mathematical background.

Connected through hyperedge HE-1 (induced by source paper "Theseus—a programming language for relational databeses"):
  with members:
    - "Types and persistence in database programming languages"
    - "An Array Algebra for Database Applications"

Connected through hyperedge HE-2 (induced by source paper "Query-by-example: the invocation and definition of tables and forms"):
  with members:
    - "Combining keyword search and forms for ad hoc querying of databases"
    - "QBE/OBE: A Language for Office and Business Automation"

Connected through hyperedge HE-3 (induced by source paper "Spatial management of data"):
  with members:
    - "The perspective wall: detail and context smoothly integrated"
    - "Spatial SQL: a query and presentation language"

Connected through hyperedge HE-4 (induced by source paper "Explaining ambiguity in a formal query language"):
  with members:
    - "AUTOJOIN: PROVIDING FREEDOM FROM SPECIFYING JOINS"

Connected through hyperedge HE-5 (induced by source paper "Relational database: a practical foundation for productivity"):
  with members:
    - "A foundation of CODD's relational maybe-operations"
    - "Human Factors Studies of Database Query Languages: A Survey and Assessment"
    - "Performance of graph query languages: comparison of cypher, gremlin and native access in Neo4j"

Connected through hyperedge HE-6 (induced by source paper "QBE/OBE: A Language for Office and Business Automation"):
  with members:
    - "A survey on content-based retrieval for multimedia databases"
    - "Query-by-example: the invocation and definition of tables and forms"

Connected through hyperedge HE-7 (induced by source paper "Human Factors Studies of Database Query Languages: A Survey and Assessment"):
  with members:
    - "An empirical investigation of voice as an input modality for computer programming"
    - "Relational database: a practical foundation for productivity"

Connected through hyperedge HE-8 (induced by source paper "Combining keyword search and forms for ad hoc querying of databases"):
  with members:
    - "Query-by-example: the invocation and definition of tables and forms"
    - "Crawling deep web entity pages"

Question: Please tell me which research area the center author belongs to. The 4 classes are: Computer science, Mathematics, Engineering, Economics, Psychology, Business. Directly output the class name.

gpt: Computer science