The Little Mermaid

I read English book. The title is "The Little Mermaid". This story is widely known. The little mermaid helps one prince at rough night. It cannot meet the prince though the little mermaid falls in love with the prince. The little mermaid asks the witch and becomes human. However, the prince marries another woman. And, the little mermaid disappeared as it was drunk by the wave. I knew the story "The little mermaid became a bubble and disappeared". However, I did not know the story "The little mermaid was drunk by the wave". I learnt that there was variously end of little mermaid's story.