Select distinct list of all elements x of all records in sql xquery

Question

Below query expression:

SELECT distinct xmlCol.value(\'(//interest/@id)[1]\',\'nvarchar(64)\') FROM table1

Returns a list of id of

Answer 1

select distinct T.N.value('.','nvarchar(64)')
from table1
  cross apply xmlCol.nodes('//interest/@id') as T(N)