Second-Highest Booking Value | Dataford Interview Questions

Sojern analysts need to validate booking values attributed to the Sojern Travel Marketing Platform. Write a PostgreSQL query that returns the second-highest distinct booking value for completed bookings attributed to that source.

Requirements

Join bookings to booking_sources using source_id.
Include only completed bookings attributed to Sojern Travel Marketing Platform.
Exclude NULL booking values and treat duplicate values as one distinct value.
Return the second-highest value using a ranking technique. Return one row with the booking value.

Schema

bookings

Column	Type	Description
booking_idPK	INTEGER	Unique booking identifier
source_id	INTEGER	Attribution source identifier
booking_status	VARCHAR(20)	Booking lifecycle status
booking_value	NUMERIC(12,2)	Monetary value of the booking

booking_sources

Column	Type	Description
source_idPK	INTEGER	Unique attribution source identifier
source_name	VARCHAR(100)	Marketing or distribution source name

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