Oracle DB 11 Complex SQL Queries/PSSQL

I am in need of a highly experienced freelancer to assist with Oracle DB 11 Complex SQL Queries/PSSQL. The purpose of the queries/PSSQL will be for data manipulation. Currently, I do not have a complete database schema or model, but I do have general data descriptions. The queries associated with this project will be highly complex. The freelancer I'm looking for should have an in-depth knowledge of Oracle DB 11 and extensive experience with SQL queries/PSSQL to ensure the success of this project. Experience handling highly complex queries is an absolute must-have. If you think you have the skills necessary to complete this work, please submit a proposal. Thank you for your time and consideration.