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    User Defined Aggregates in LDL++

    Haixun Wang
    UCLA CS Dept.


     
    • Introduction
      • Aggregate in Deductive Database Systems
      • Iterative Routine in SQL3
    • Aggregates in LDL++
    • Defining Aggregates
    • Implementation of Extended Aggregates in LDL++
    • Built-in Aggregates
    • Aggregation Examples
      • Return Avg Every 5 Records
        • LDL++ Source Code
        • Data
        • Query Result
      • Return Sum until It Exceeds 100
        • LDL++ Source Code
      • Relation Subset
        • LDL++ Source Code
        • Data
        • Query Result
      • On-line Average Estimation
        • LDL++ Source Code
        • Data
        • Query Result
      • On-line Median Estimation
        • LDL++ Source Code
        • Data
        • Query Result
      • Temporal Aggregation
        • Temporal Projection
        • Running Aggregate
        • Quantified Aggregate
        • Moving Average
      • Roll-ups for Data Cubes
        • LDL++ Source Code
        • Data
        • Query Result
    • References
    • About this document ...

    Haixun Wang
    11/17/1998