In this blog post, you’ll learn more about the Sybase Error Cannot create %1 HG index because one already exists on the given columns. and the reason for receiving this error
Sybase SQL Error Message
Cannot create %1 HG index because one already exists on the given columns.
Reason for this Error
Only a single HG index of a given type can be created on the same column set. For example, you cannot have two unique HG indexes on the same column set, but you are allowed to have a unique HG and a non-unique HG index on the same set of columns.