sql server - SQL Query / Herigate data join -


i have 2 tables, first person data

id name

the second has each person relatives

primary key field person (references person.id) relativetype (mother or father) parent (references person.id)

i'm trying sons , grandsons of specific person , i'm stuck integrating grandsons in query results. i'm using sql server.

any ideas?

the query need depends highly of how many level have of parent-child relationship. if can change schema, recommend turn using hierarchyid sql server specific data type. have here.

in following, assume have 2 levels. father - son - grandson

;with sons (     select pdf.id, pdf.name, pdd.id parentid, pdd.name parent persondata pdf     join personrelative pr on pdf.id = pr.parent     join persondata pdd on pr.person = pdd.id //selecting parents )  select pd.name, s.name son, 'son' type persondata pd join sons s on pd.id = s.parentid  union  select pd.name, gs.name son, 'grandson' type persondata pd join sons s on pd.id = s.parentid join sons gs on s.id = gs.parentid

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