Build a sales history database

Objective: Utilize our CRM field history to recreate sales history for each year. Showing year to date year over year where necessary Why? Users need to be able to select the period of time they want to see sales figures. So we can see how we are doing year to date How? Queries need to be created in our SQL. I will supply an anonymised data set in CSV which can be imported into your platform to create the proof of Concept. There are circa 20 tracked fields which help generate our figures. They will need a Skills? Very comfortable designing and building SQL database structures and complex dependent queries referencing multiple tables, variables and parameters Deliverables? Working SQL queries and database structure so I can replicate this in our SQL platform NOTE: Complex SQL query experience essential