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Quick Summary

Filter calls based on the sender's country.
Exclude invalid pickup statuses from both numerator and denominator.
Calculate and round the pickup success rate as a percentage.

What This Tests

Table joining on foreign keys
Conditional aggregation for ratio calculation
Handling invalid data and edge cases
Precision rounding and zero-division protection

Common Patterns

Inner Join

Aggregation

Test Cases

Input

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Output

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Expected

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