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Query Processing & Optimization -Query Optimization through Transformation
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This video describes how to transform one query into another in order to optimize it.
To watch the previous video with the remaining 8 rules of query equivalence, use the following link:
To watch the video about materialization and pipelining, use the following link:
Review Questions:
1. Is union commutative?
2. Is intersection commutative?
3. Is set difference commutative?
4. Is union associative?
5. Is intersection associative?
6. Give an example of a query optimization.
7. Which type of an operator tree is considered better for evaluation? One with more levels or one with less levels?
To watch the previous video with the remaining 8 rules of query equivalence, use the following link:
To watch the video about materialization and pipelining, use the following link:
Review Questions:
1. Is union commutative?
2. Is intersection commutative?
3. Is set difference commutative?
4. Is union associative?
5. Is intersection associative?
6. Give an example of a query optimization.
7. Which type of an operator tree is considered better for evaluation? One with more levels or one with less levels?
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