* Earning a degree *without* a previous degree: This is perfectly possible. Many people earn their first degree (e.g., a bachelor's degree) without having any prior degrees.
* Earning a *different* degree: You can earn a second degree (or third, fourth, etc.) after already having one. For example, someone with a bachelor's degree in biology could go on to earn a master's degree in public health.
* Earning a degree through alternative pathways: There are alternative ways to earn a degree, such as through online programs, accelerated programs, or programs that offer credit for prior learning. These are still degrees.
To clarify your question, please rephrase it to specify what you mean.