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What Takes Place During the Extraction Part of ETL

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What takes place during the extraction part of ETL?


Definitions:

Random Variable

A variable whose possible values are outcomes of a statistical experiment and which can vary randomly.

Probability

The measure of the likelihood that an event will occur, expressed as a number between 0 (impossible) and 1 (certain).

Poisson Probability

A distribution used to predict the probability of a given number of events happening in a fixed interval of time or space, given a constant mean rate of occurrence.

Defects

Imperfections or faults in a product or process that deviate from desired performance or specification.

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