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Question:  What is the basic difference between primary key and (unique key along with Not NULL).



April 04, 2007 06:41:35 #5
 Maria   Member Since: Visitor    Total Comments: N/A 
RE: What is the basic difference between primary key a...
 
primary key = unique + not null + the only one PK column in the table + index on the PK column Created index enchances the queries on the PK column.
     

 

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