Analyze data with SQL - CoolTShirts Marketing Attribution project

Hi there! My shot at the CoolTShirts Marketing Attribution project. Here is the presentation, which includes all relevant queries… and a specific, curious finding which I have not seen in any of the CoolTShirts presentations I have been looking at! (See slides 9 to 11 for further details).

I would like to thank @oliverclark specifically for 4 icons I have borrowed from his presentation. I also apologise if by doing so I have incommodated you in any way.

Thank you in advance for any feedback!