The retrieval of data from a database in a computerized database management system is optimized through the use of {HEAD ~ a plurality} of {TAIL ~ join} indexed 
The retrieval of data from a database in a computerized database management system is optimized through the use of { HEAD ~ a plurality } of { TAIL ~ join } indexed
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL OTH