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Data pipelines & processing

ETL-style flows, batch transforms, validation, and moving data between formats.

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Data pipelines & processing medium

How to Implement Slowly Changing Dimension Type 2 History in Python

Build a type-2 slowly changing dimension pipeline that closes old records and opens new ones when customer data changes.

scd dimension history
Python 
from datetime import datetime, timedelta

def apply_scd_type2(records, current_date):
    """Returns active records after inserting new records with type-2 history."""
    history = []
    active = {}

    for record in records:
        key = record["customer_id"]
        if key in active:
            active[key]["end…
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