我正在努力让这件事变得如此简单.无论我到哪里,它都说它很简单：
$createuser -P
但那总是会失败：
$creation of new role Failed: ERROR: role "postgres" already exists
现在怎么办？
$createuser -P
但那总是会失败：
$creation of new role Failed: ERROR: role "postgres" already exists
现在怎么办？
