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I combine these column as primary key.
room_no, type
When I insert new data for example, 0001 01.
And then I insert 0001 02.
It can not be done. It said duplicate primary key. Why it duplicate although I define 2 columns as a primary key.
This is same as compsite primay key working.
You can read this article:- http://www.techrepublic.com/article/the-great-primary-key-debate/1045050