Answer Posted / mapuka mueller

A unique key in sql signifies an attribute of an entity in a
table with the unique constraint, which simply implies that,
that a record(value) of that attribute can not be entered
more than once in that column (except null).
A further assignment of the primary key constraint to that
attribute (or a composite of two or more attributes(columns)
from values on the same row) makes it the unique identifier
of the record(row) in that table.

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