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INTRODUCTION TO ECONOMICS:
database statistics
The main factors affecting the performance of the execution strategy are: Intermediate relationships are created during execution. when following up If the job is on another site, you must submit an intermediate relationship.
The main factors affecting the performance of the execution strategy are: Intermediate relationships are created during execution. when following up If the job is on another site, you must submit an intermediate relationship.
ECO401 HIGHLIGHTED HANDOUTS
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CS201 Assignment 1 Solution Spring 2022
IT430 Assignment 1 Solution Spring 2022
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ACC311 GDB 1 Solution Spring 2022
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ECO401-INTRODUCTION TO ECONOMICS
There is no direct trade-off between statistical accuracy and cost. By managing this, more accurate statistics are expensive. for each relationship R[A1, A2, …, An] is R1, …, is fragmented by Rr, and the statistical data is usually:
1. The length of each attribute: length(Ai) Number of distinct values for each attribute in each piece: card (πAi(Rj))
The maximum and minimum values in the domain of each attribute: min(Ai), max(Ai) Cardinality of each domain: card (dom [Ai]), and cardinality of each domain.
The maximum and minimum values in the domain of each attribute: min(Ai), max(Ai) Cardinality of each domain: card (dom [Ai]), and cardinality of each domain.
ECO401 HIGHLIGHTED HANDOUTS-INTRODUCTION TO ECONOMICS
Piece: Card (Rj) SJF(R, S) = Card(R ⋈ S) / (Card(R) combining optional elements for some of the relationships
* card) The cardinality of Interim Results Database statistics is useful for evaluating the cardinality of intermediate results.
ECO401 HIGHLIGHTED HANDOUTS PDF-INTRODUCTION TO ECONOMICS
Query. Databases generally have two simplification assumptions. that much In a relationship, the distribution of attribute values must be uniform, and all attributes must This means that the value of one attribute does not affect the value of another attribute.
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