what is Composite key in table creation? what is the use?
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Answer Posted / nishant nayak
A composite key consists of two or more columns, designated together as a table's primary key. Multiple-column primary keys can be defined only as table-level constraints:
A composite key has more than one attribute (field).
Used in database management systems as a key which has two or more fields in the columns in the table, or in a file.
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