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Asked: 2026-05-11T02:06:26+00:00

Given the one-table design given below how would the following best be queried The

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Given the one-table design given below how would the following best be queried

  • The set of extended family members given a folk id
  • The set of common ancestors given two folk ids
  • The set of descendants given a folk id

*Bonus 1st cousins, twice removed given a folk id

Table Folk

FolkID (PK) MotherID (FK to folkid) FatherID (FK to folkid) Name Gender
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1 Answer

  1. Someone has to build a familytree application? I did something similar some time ago, using XML and XPath:

    <Persons>      <Person ID='1' Name='Minu eesnimi' Surname='Minu perekonnanimi' Picture='0' Sex='M'>           <Event Name='Birth' Prefix='' Location='Tallinn' Date='14.01.1963'><![CDATA['Ilusal jaanuarihommikul']]>           </Event>           <Event Name='Death' Prefix='' Location='' Date=''/>           <Father ID='2' Type='P&#228;ris'/>           <Mother ID='3' Type='P&#228;ris'/>           <Spouse ID='4'/>         </Person> ...

    String XPath=’child::*/child::Person[child::Father[@ID=\”+String(ID) +’\’] and child::Mother[@ID=\”+String(Spouse)+’\’]]’; etc.

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