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SQL Top 5 Stores by Sales Growth

MediumSQL · PostgreSQL00:00
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Your question is SQL Top 5 Stores by Sales Growth. Start with the requirements and the two tables on the right.

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Problem

Sherwin-Williams operations leadership wants to identify stores with the strongest recent sales increases. Write a PostgreSQL query that compares each store's monthly completed sales with the preceding month.

Requirements

  1. Aggregate non-null completed sales by store and calendar month.
  2. Calculate the previous month's sales and percentage growth using a window function.
  3. Exclude months without a prior month or with prior-month sales of zero.
  4. Return the five highest growth store-month results, ordered by growth percentage descending, with deterministic tie-breaking.

Schema

stores
ColumnTypeDescription
store_idPKINTUnique Sherwin-Williams store identifier
store_nameVARCHAR(100)Store display name
regionVARCHAR(50)Operating region
store_sales
ColumnTypeDescription
sale_idPKINTUnique sales record identifier
store_idINTStore associated with the sale
sale_dateDATEDate of the transaction
net_salesDECIMAL(12,2)Net sales amount
sale_statusVARCHAR(20)Transaction processing status
Tablesstoresstore_sales
Your solutionPostgreSQL
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