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