(B)0[mduplicates-clause =
qqq> [4mDUPLICATES[m ARE qqwqqqqqqq>qwqq> [4mALLOWED[m qq>
mq> [4mNOT[m qqj
A clause specifying whether each value of the index must be
unique. If you try to store the same value twice in an indexed
field defined as DUPLICATES NOT ALLOWED, Oracle Rdb returns an error
message and does not store or modify the record.