Primary Key Is Like A Father In House

a: Primary key ~
b: a father in house

What: "a primary key is like a father in house, like only one but there may be a lot of childs just like columns." This is good. If there are children in a house, there must be a father. If there are rows in a table they must have a primary key, otherwise they are orphan rows.

Writer: Ashis Kumar Jena
Date: Dec 16 2011 7:15 PM

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