About This Architecture

Spare Parts Shop ERD models a multi-currency invoicing system with inventory management, employee authentication, and line-item tracking across Categories, Goods, Employees, Invoices, and Invoice_Items tables. Data flows from Categories through Goods to Invoice_Items, with Employees linked to Invoices and optional Technician references, supporting SAR and YER currency conversions. This schema demonstrates normalized relational design for retail operations handling stock quantities, cost tracking, profit margins, and exchange rate snapshots at transaction time. Fork and customize this ERD on Diagrams.so to adapt it for your spare parts, automotive, or equipment rental business. The optional Technician_ID field and computed Final_Total_YER showcase real-world complexity in multi-currency, service-inclusive invoicing.

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How do I design a database schema for a spare parts shop with inventory, invoicing, and multi-currency support?

This ERD normalizes Categories, Goods, Employees, Invoices, and Invoice_Items to manage spare parts stock, track costs and profit margins in SAR, and record sales in YER with exchange rates captured at transaction time. The schema supports employee authentication, optional technician assignment, and computed totals for accurate multi-currency invoicing.