Question: A primary key used in a database is a _ _ _ _ _ _ _ _ . ( TCO 7 and TCO 1 2

A primary key used in a database is a ________.
(TCO 7 and TCO 12)
Group of answer choices
group of rows that are formed to identify a unique table or file
column or group of columns that identifies a unique row in a table
character or byte that represents fields or columns
group of tables or files formed to identify a unique field or row

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