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Graphics Interchange Format  |  1997-01-15  |  54.4 KB  |  467x313  |  4-bit (16 colors)
   ocr: Step 1.1 indexeson skill" and "city"a areusedto retrieve qualifying entries, T1 skill RID T2 city RID engineer 383 Newark 423 engineer 423 Newark 799 engineer 555 Newark 233 Step 2:Anintersectionoff RIDSisperformed,with one RID qualitying. RESULT 423 FIGURE 3. Logic cofindexing ANDing for query on Newark-based engineers.