what is unique key?
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Answer Posted / koteswara rao.k
suppose you have landline and through the landline you have
taken net connection .
so at the end of the month you will get two bills on the
landline which is subject to one means
primary key is landline which is parent one ( customer
code available)
broadband and landline ( two bills generation ) are the
unique keys called child keys .(contract ids available)
so in this scenario contract ids can be null but cannot be
duplicate .
One more You cannot remove the primary key until and unless
remove the branched ones.
I have good knowledge on GSM /broadband/pstn technologies .
Any wrong ping with me pls koteswara.9.rao@gmail.com
| Is This Answer Correct ? | 10 Yes | 5 No |
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