urgent answer

A company have decided to make a mobile app which can be used to hire electrician and/or plumber by its users. Once a nearby plumber or electrician is assigned and work is done, complete receipt with inventory, labor and service charges are displayed on the app. You are required a make a relational database with the tables for electrician/plumber (including contact details, expertise and id), inventory (including products, ids, prices, tax, etc.) and receipt (including fields from last two tables). Define all the fields in all the tables with data validation and primary keys. Define one-to-many relationship between the three tables. Make Use-case diagram for plumbers/electricians, customer and management?