记住这个术语: ETL

记住这个术语,不要老记成DTL, DSL之类的

WIKI:

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Extract, transform and load (ETL) is a process in database usage and especially in data warehousing that involves:

    * Extracting data from outside sources

    * Transforming it to fit operational needs (which can include quality levels)

    * Loading it into the end target (database or data warehouse)

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