i am trying to make a simple php - postgresql that is just like youtube but instead shares audio files and is simple... the problem is i only know mysql and now im having problems presenting it to my instructor...

i have made an er diagram but need to convert it to an eer... really need help on this one... and if you guys could construct the table in postgresql that would be wonderful... and after i finish it ill let you guys have a preview... thank you!!

in my er diagram it goes like this
-->Members can upload audio files
--> has a playlist that can add other users audio and automatically add his/her uploaded files in his/her playlist
--> can comment on other users audio

nonmembers can only listen to members uploaded audio