Spj queries - PowerPoint PPT Presentation

Supporting Ad-Hoc Ranking Aggregates

Supporting Ad-Hoc Ranking Aggregates. Chengkai Li (UIUC) joint work with Kevin Chang (UIUC) Ihab Ilyas (Waterloo). Ranking (Top-k) Queries. Find the top k answers with respect to a ranking function , which often is the aggregation of multiple criteria .

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496 views • 30 slides

Nested Queries and Aggregation

Nested Queries and Aggregation. Chapter 5 (6/E) Chapter 8 (5/E). Lecture Outline. More Complex SQL Retrieval Queries Self-Joins Renaming Attributes and Results Grouping, Aggregation, and Group Filtering Ordering Results Nested SPJ Queries. Review of SPJ Queries in SQL.

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540 views • 18 slides

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