“Group by” in DM Algorithm with DB

• Set oriented computation

  • Evaluating plural hypotheses at one time
    • Reduction of the access
    • Reduction of passes over data

• Condition for Group By

  • the same select, from and where in SQL = same predicates
  • grouping by attribute value(s) = different constant(s)

• In which case in ILP?

  (1) Constant in the Head
  
  • Multiple-valued classification problem
  (2) Constant in the Body
  • Non-determinate background knowledge including constant
  (3) both of (1) and (2)

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