Creating a 4-5-4 Retail Calendar using SQL and dbt

The 4-5-4 calendar is a guide for retailers that ensures sales comparability between years by dividing the year into months based on a 4 weeks – 5 weeks – 4 weeks format. The layout of the calendar lines up holidays and ensures the same number of Saturdays and Sundays in comparable months.

If you work at an ecommerce business, this is a must-read. Retail businesses thrive on their ability to compare sales to some prior period (month, quarter, year...) and the year-to-year variability of the Gregorian calendar makes this challenging. The 4-5-4 calendar is a well-established answer to this problem in retail, and the author goes deep on how to implement one in your data warehouse.


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