Effect of reversing the order of columns in mutli-column stats - response (1) by ulrich

at least up to 13.10 - I am not 100% sure about 14.0.
see http://developer.teradata.com/blog/carrie/2012/04/teradata-13-10-statistics-collection-recommendations
Only the 16 bytes of the concatenated columns are use. So order can change the results if the concatenated column length > 16 bytes.