A retail company wants to train a machine-learning model using purchase order records stored in CSV files with columns such as customer_id, order_date, and total_amount. How should this dataset be classified?
Semi-structured JSON documents
Unstructured data
Structured data
Time-series sensor data
CSV files with well-defined columns represent data that fit neatly into a tabular, relational format. Such information is organized by fixed schemas (rows and columns), so it is considered structured data. Unstructured data refers instead to content like free-form text, images, or audio that lacks a predefined model. Semi-structured JSON and time-series sensor readings are different data categories and do not match the tabular CSV scenario described.
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