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Handling Missing Data
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Handling Missing Data

EasySQL · PostgreSQL

Problem

How would you handle missing data in a dataset?

Write a SQL query that returns every sales record while replacing missing product names and regions with Unknown Product and Unknown. Replace missing quantities and prices with 0 for reporting purposes.

Output

  1. One row per sales record with columns sale_id, product_name, region, quantity, and unit_price
  2. Include all records, with no remaining NULL values in the output columns
  3. Order results by sale_id ascending

Schema

sales_records
ColumnTypeDescription
sale_idPKINTUnique identifier for the sales record
product_nameVARCHAR(100)Name of the purchased product
regionVARCHAR(50)Sales region
quantityINTNumber of units sold
unit_priceNUMERIC(10,2)Price per unit
Tablessales_records
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