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Decomposition and Higher Forms of Normalization

Decomposition and Higher Forms of Normalization. Chapter 15.8 (skim). "Lossless" Joins. The main idea: if you decompose a relation schema, then join the parts of an instance via a natural join, you might get more rows than you started with, i.e., spurious tuples This is bad!

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Higher Forms of Normalization

Higher Forms of Normalization. Chapter 13.1-13.3 (skim). "Lossless" Joins. The main idea: if you decompose a relation schema, then join the parts of an instance via a natural join, you might get more rows than you started with, i.e., spurious tuples This is bad! Called a "lossy join".

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170 views • 9 slides

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Preserving fds - PowerPoint PPT Presentation

Decomposition and Higher Forms of Normalization

Higher Forms of Normalization