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Relational vs Similarity Selection

Relational selection is based on a boolean condition C
  • evaluate C for each tuple t   (or a likely subset of tuples)
  • if C(t) is true, add t to result set
  • if C(t) is false, t is not part of solution
  • result is a set of tuples { t1, t2, ..., tn } all of which satisfy C
Uses for relational selection:
  • precise matching on structured data
  • using individual attributes with known, exact values