A key is a combination of one or more columns that is used to identify particular rows in a relation.
KEYS in DBMS (database management system) is an attribute or set of attributes which helps you to identify a row in a relation(table). They allow you to find the relation between two tables.
Keys help you uniquely identify a row in a table by a combination of one or more columns in that table. Key is also helpful for finding unique record or row from the table.
Database key is also helpful for finding unique record or row from the table.
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