Composite key means nothing in PL/SQL. However in SQL, a composite key is a combination of more than one column to identify a unique row in a table.
For example, A customer table with Customer_ID, First Name, Last Name, Date of Birth may have a unique key in the customer ID, but a composite key may be LAST NAME, FIRST NAME and Date of Birth (Although, theoretically, there can be two John Smiths born on the 4th of July, 1776).
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