如何检测Oracle中的表上是否存在特定列的索引？

A table exists that someone else loaded. I need to query against the table, but the lack of indexes makes the query plan abysmal. What I would like to do is detect if there is an index for a particular column, so that I can created it if it does not exist, and not create it if it is already there.A table exists that someone else loaded. I need