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SQL for Inventory Trends
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SQL for Inventory Trends

MediumSQL · PostgreSQL

Problem

Can you write a SQL query to analyze food inventory data for trends?

Use the provided food item and inventory movement data. Include completed inbound and outbound movements, while ignoring movements with an unknown category or NULL movement date.

Output

  1. One row per food category and calendar month.
  2. Columns: category, month, total_received, total_consumed, net_change, movement_count, and trend.
  3. Sort by category alphabetically, then month chronologically.
  4. Classify trends as Increasing, Decreasing, or Stable based on net change.

Schema

food_items
ColumnTypeDescription
food_item_idPKINTUnique identifier for the food item
item_nameVARCHAR(100)Name of the food item
categoryVARCHAR(50)Food category
inventory_movements
ColumnTypeDescription
movement_idPKINTUnique identifier for the inventory movement
food_item_idINTReferenced food item
movement_dateDATEDate when the movement occurred
movement_typeVARCHAR(40)Movement direction, such as IN or OUT
quantityNUMERIC(12,2)Quantity moved
statusVARCHAR(30)Processing status of the movement
Tablesfood_itemsinventory_movements
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