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Star Attributes and Star Nodes

  • Intuition: If a single-dimensional aggregate on an attribute value p does not satisfy the iceberg condition, it is useless to distinguish them during the iceberg computation  
    • E.g., b2, b3, b4, c1, c2, c4, d1, d2, d3  
  • Solution: Replace such attributes by a *. Such attributes are star attributes, and the corresponding nodes in the cell tree are star nodes


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