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Answer Posted / manoj
primary key is a key which always accept unique value.
secondary key is a key which when you are making primary key
for more than one column as primary key for retrieving of
reords.
eg.
create table tnam
(ano number,
bno number,
bname char(12),
primary key(ano,bno))
In this bno is secondary key.
| Is This Answer Correct ? | 31 Yes | 18 No |
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