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Question
What is the use of placing primary key and foreign key
constrains on columns.
 Question Submitted By :: Durga Prasad
I also faced this Question!!     Rank Answer Posted By  
 
  Re: What is the use of placing primary key and foreign key constrains on columns.
Answer
# 1
TO CREATE REFERENTIAL INTEGRITY BETWEEN 2 TABLE.
 
Is This Answer Correct ?    1 Yes 0 No
Monal
 
  Re: What is the use of placing primary key and foreign key constrains on columns.
Answer
# 2
If you maintain  this relation ship you can get more advantages

1)you can not delete primary table directly..

2)duplicate values are not allowed in primary key table.

3)Null values are not inserted into primary key table so
validation is very easy fro m front end.(for ex; .net 2005).




 
Is This Answer Correct ?    1 Yes 0 No
Jagadeesh B
 
 
 

 
 
 
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