SQL: Find the 2nd Highest | Dataford Interview Questions

Blue Yonder's Luminate Planning data team needs to identify distribution centers with the second-highest inventory valuation among active facilities. Write a PostgreSQL query that ranks distinct non-null inventory values and returns every facility tied at rank two.

Requirements

Join inventory valuations to facilities and include only active facilities.
Exclude rows where inventory_value is NULL.
Use a window function such as DENSE_RANK so ties at the second-highest distinct value are retained.
Return the facility name and inventory value, ordered by facility name.

Schema

facilities

Column	Type	Description
facility_idPK	INTEGER	Unique distribution center identifier
facility_name	VARCHAR(100)	Distribution center name
region	VARCHAR(50)	Operating region
is_active	BOOLEAN	Whether the facility is currently active

inventory_valuations

Column	Type	Description
valuation_idPK	INTEGER	Unique valuation record identifier
facility_id	INTEGER	Facility associated with the valuation
sku_code	VARCHAR(30)	Stock keeping unit code
inventory_value	NUMERIC(12,2)	Total inventory valuation amount

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