What is difference b/w composit key n primary key and
forigion key?
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Answer Posted / sathish
Assume a table contains columns
book name
author name
price
>>composite key
Having multi column primary key for a single table is known as composite key.
ex: primary composite key is book name and author name
>>primary Key
Primary key is the unique key, do not accept null value and used as a id to fetch the record from the table.
>> Foreign Key
A primary key of a table which is used as a reference key of another table..
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