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Applying Unary (recursive) relationship

Discussion in 'MS Access' started by nhaddad, Nov 26, 2006.

  1. nhaddad

    nhaddad New Member

    Nov 25, 2006
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    University College student majoring in Computer Sc
    Hi. I want to apply a unary relationship to my database. I tried a lot, searched a lot, but couldn't find an answer. To make it quick and easy, here's my problem:
    iam making a contacts database in MS Access. The contacts table contain first, middle, and last names for each person, and other attributes that doesn't relate to my problem. I want to create a unary relationship (parent-child), where each person have an attribute, that is a foreign key for his or her father or mother's primary key.
    What i thought of is to make a supertype/subtype relationship, where each person can be a parent, child, or both.
    So the final question would be:
    Is there a way to apply unary relationships in MS Access? If yes, how? If no, is it done by using supertype/subtype relationship? If yes, thank you. If no, what should i do?
    Thanks for any help.
  2. rahulnaskar

    rahulnaskar New Member

    Aug 26, 2004
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    Let the table have a simplified structure like mentioned:

    contactid: ID of the contact being saved
    name: Name of the contact
    parentid: His/her parent's ID

    The SQL statement will return all contacts and corresponding parent id:

    SELECT a.contactid, a.name, b.parentid, b.name
    FROM table1 AS a, table1 AS b
    WHERE a.parentid=b.contactid;

    Hope this helps...

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