hello, i was wondering if someone could explain to me the differences 
between

heroku db:push

heroku run rake db:migrate

heroku run rake db:populate

heroku run rake db:reset

it seems like heroku run rake db:reset resets the db, but for some reason 
when i do it, it also migrates everything. what is the point of doing 
heroku run rake db:migrate? and isn't that the same as populating? and if 
all the data is moving into the db, what difference does heroku db:push do?

and as a side note, do people only with dedicated databases use the pg gem? 
for people sharing a shared db, then we would be using db instead of pg, 
correct?

clear and thorough help would be appreciated = ) im having issues with my 
heroku commands so maybe understanding them would be helpful as well = )

thanks!

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