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itmaster
Starting Member
28 Posts |
 Posted - 2013-09-10 : 19:41:24
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| Hi,Can someone please tell me if I have this right.I have always been taught that you can connect two table if the have a 1 to many relation ship. However, if you have a Many to many relation ship you cannot connect them. In this case you need an intersection table put between them. I have seen though people doing this even though the first two table form a one to many relation ship. Is there a circumstance where you would do this, without having a many to many relationship. thank you |
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itmaster
Starting Member
28 Posts |
Posted - 2013-09-11 : 11:36:51
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| Maybe I put this in the wrong forum? Can it be moved to Database Design and Application Architecture?Thank you |
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visakh16
Very Important crosS Applying yaK Herder
52326 Posts |
Posted - 2013-09-12 : 16:39:23
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| you may need a intermediate table in one to many relationships when many part table will have some attributes which is not dependent on each instance of relationship and just depends on its key. In that case to avoid redundancy in repeating values for all those related attributes, you apply normailsation and seperate them out into a its own master table and you will just have relationship in a intermediate table with just the keys from participating tables and any attributes which stands unique for each of the relationship.------------------------------------------------------------------------------------------------------SQL Server MVPhttp://visakhm.blogspot.com/https://www.facebook.com/VmBlogs |
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itmasterw
Yak Posting Veteran
90 Posts |
Posted - 2013-09-16 : 13:17:22
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quote:
Originally posted by visakh16
you may need a intermediate table in one to many relationships when many part table will have some attributes which is not dependent on each instance of relationship and just depends on its key. In that case to avoid redundancy in repeating values for all those related attributes, you apply normailsation and seperate them out into a its own master table and you will just have relationship in a intermediate table with just the keys from participating tables and any attributes which stands unique for each of the relationship.------------------------------------------------------------------------------------------------------Thank you SQL Server MVPhttp://visakhm.blogspot.com/https://www.facebook.com/VmBlogs
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a data modeling question