I've created a table on Vertica, and I want to create an index on that table. I can't see how to create an index on Vertica, though. Is it possible? If so, how can I do that?
Vertica's speed is hinged on using columnar projections, not indexes. Please see: https://my.vertica.com/docs/6.1.x/HTML/index.htm#12037.htm
So, in fact, Vertica doesn't have the ability to create an index. You will have to use a projection to achieve good performance.