Many databases originate from spreadsheets, and migrating data from Google Sheets to a relational database like PostgreSQL involves several important considerations, including data modeling, handling missing data, and setting up user permissions. Unlike Google Sheets, relational databases require a structured data model with consistent data types, primary keys, and defined relationships between tables. The migration can be executed through various methods, such as exporting data to a CSV file and using the COPY command in PostgreSQL, or utilizing GUI tools like pgAdmin for a more user-friendly experience. Additionally, third-party services like Retool offer alternative solutions for data import and management, providing features like a spreadsheet-like UI and hosted database options. Each method has its own complexities and is chosen based on the specific needs and scale of the data migration project.