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A phisical file has two fields like 1) Account No(10,0)
2)Phone No(15,0)Unique on both fields?Please give me the
answer for this?
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Answer Posted / amit
If you use UNIQUE on both fields then one account will
allow only one phone number. Another phone number can't be
used there similarly you can't have one phone number
associated with multiple account.
however if you give unique constraint for the key
combination then it would ensure that you have account
number and phone number combination is unique.
So you can have same account number with multiple phone
numbers and vice versa.
| Is This Answer Correct ? | 3 Yes | 1 No |
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