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SQL Query Difficulty Pair
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SQL Query Difficulty Pair

MediumSQL · PostgreSQL

Problem

They ask you two SQL questions, one easy and one hard. How do you handle both?

Write PostgreSQL queries using the provided customers and orders tables. The easy result summarizes completed orders for every customer. The hard result returns customers with at least two completed orders and ranks them within their region by completed spend.

Output

  1. Return one combined result set with question_level, customer_name, total_completed_spend, completed_order_count, and region_rank.
  2. Include all customers in the easy rows. Include only qualifying customers in the hard rows.
  3. Sort by question_level, then customer_name.

Schema

customers
ColumnTypeDescription
customer_idPKINTUnique customer identifier
customer_nameVARCHAR(100)Customer display name
regionVARCHAR(50)Customer region
orders
ColumnTypeDescription
order_idPKINTUnique order identifier
customer_idINTCustomer associated with the order
statusVARCHAR(20)Order lifecycle status
amountNUMERIC(10,2)Order amount
Tablescustomersorders
Interviewer

Your question is SQL Query Difficulty Pair. Start with the requirements and the two tables in the Question tab.

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CodePostgreSQL
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