When would you usually specify primary key constraints? Can you specify them after creating a table? How?

Oracle 12c: SQL
3rd Edition
ISBN:9781305251038
Author:Joan Casteel
Publisher:Joan Casteel
Chapter4: Constraints
Section: Chapter Questions
Problem 4MC: What is the maximum number of PRIMARY KEY constraints allowed for a table? a. 1 b. 2 c. 30 d. 255
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When would you usually specify primary key constraints? Can you specify them after creating a table? How?

 

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