Which edition should i download? Community or Enterprise?
i want to build Qt all by myself, and where can i download the whole Qt code?
the Enterprise, the Community edtion or Professional?
which one include the whole Qt code.
Get qt-everywhere-opensource-src-5.4.1.zip (if you're on Windows). See http://www.qt.io/download/ for a comparison between Enterprise, Community, etc.
Enterprise contains more code than Community, but you have to buy a license. The Community version is free.