Grokking SQL for Tech Interviews
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7. Product Price on a Specific Date
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Problem Statement

Table: PriceChanges
This table records the price changes of various products. Each row includes a product ID, the new price of the product, and the date when this new price became effective.

+---------------+---------+
| Column Name   | Type    |
+---------------+---------+
| product_id    | int     |
| new_price     | int     |
| effective_date| date    |
+---------------+---------+
(product_id, effective_date) is the primary key for this table.
Each row in this table indicates that the price of a product was changed to a new price on a specific date.

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Table of Contents

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