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Operations for Nd Select

N-dimensional select queries = condition on ≥1 attributes.
  • pmr = partial-match retrieval (equality tests), e.g. 

    select * from Employees
where  job = 'Manager' and gender = 'M';

  • space = tuple-space queries (range tests), e.g. 

    select * from Employees
where 20 ≤ age ≤ 50 and 40K ≤ salary ≤ 60K