Need to create a free cloud based relation database.

I need to create a relational database for someone who doesn't know how to code. This person needs a basic cost free cloud based relation database to store, access, and alter the data. He wants drop down choices on some of the fields and attach verbal recorded information as files. Right now his data is in raw form and residing in google drive. I myself is new in this field but has a strong SQL coding skill. I plan to create the entire database using SQL programming language. But I'm confused as to how my client will query and alter the data since he doesn't know coding (I know it's a silly question). Can anyone suggest a platform that fulfills the requirements? Thank you