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Creating Basic SQL Reports in PostgreSQL

Introduction
Multiple metrics for a single object
Metrics for two groups
Ratios and percentages
Global vs. specific metrics
Summary
17. Question 3

Instruction

Excellent work! Let's move on to Question 3.

Exercise

What percentage of all products are unavailable (have no units in stock)? Show three columns: count_unavailable, count_all, and unavailable_percentage. Round the percentage to three decimal places.

Stuck? Here's a hint!