What does the SQL constraint "PRIMARY KEY" do?

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What does the SQL constraint "PRIMARY KEY" do?

Ensures that all values in a column are unique

Specifies a default value for a column

Defines a column to uniquely identify each row in a table

Enforces a condition on the values allowed in a column

This question is part of this quiz :

SQL Aggregation Functions & Constraints Quiz
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SQL
SQL Quiz
Databases
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