This is index question.
If you have oracle database, and have the index A + B + C colume.
You might need the index A+ B or A.
Oracle Database automatically check these case and prevent these case,
So can save disk space and prevent not using original A+ B+ C index.
What is your opinion?
If This is the right scenario we might ask oracle to make constraint on index creation.
So we only have one index A+B+C. and probibit creating A+B or A by mistake.
Give your opinion.
Xie Xie