-- SOURCE: https://leetcode.com/problems/replace-employee-id-with-the-unique-identifier/description/?envType=study-plan-v2&envId=top-sql-50 -- (id, unique_id) is the ...
(id, unique_id) is the primary key (combination of columns with unique values) for this table. Each row of this table contains the id and the corresponding unique id of an employee in the company.
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