The invention relates to {TAIL ~ database management systems}, and in particular, to generating {HEAD ~ one or more indices} over a table column 
The invention relates to { TAIL ~ database management systems } , and in particular , to generating { HEAD ~ one or more indices } over a table column
OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH