It's possible to keep a goldfish in a bowl, but they shouldn't be kept in one. A bowl is too damned small for a goldfish. If you want you goldfish to be happy, give the poor thing a proper tank, and not plop him into a tiny tank for 'decoration'.
Goldfish are a treat to the eye. And to ensure that your goldfish lives a long and healthy life, you need to know everything about goldfish care in a bowl. This article provides information about the same.