75. Defining Valid Dates

This advanced SQL exercise is part of the book: Advanced SQL – Practical Techniques and Use-Cases, which includes 100 day-to-day SQL challenges (and solutions), need-to-know advanced features, and key concepts.

An advertising firm manages the following tables:
The first table specifies a list of public holidays. Each row specifies the holiday’s serial number, start date, and end date:

(HID int identity(1,1),
HStart date,
HEnd date)

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