Chapter 6: Query Decomposition and Data Localization
Chapter 6: Query Decomposition and Data Localization
Chapter 6: Query Decomposition and Data Localization
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<strong>Data</strong> <strong>Localization</strong> . . .<br />
• Example (contd.): Unnecessary work can be eliminated<br />
– e.g., EMP 3 ⋊⋉ ASG 1 gives an empty result<br />
∗ EMP3 = σ ENO>”E6” (EMP)<br />
∗ ASG1 = σ ENO≤”E3” (ASG)<br />
DDB 2008/09 J. Gamper Page 18
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