Eliminación de datos jerárquicos en la tabla SQL

En SQL Server:use una consulta recursiva. Dado CREATE TABLE tmp (Id int, Parent int), use

WITH x(Id) AS (
    SELECT @Id
    UNION ALL
    SELECT tmp.Id
      FROM tmp
      JOIN x ON tmp.Parent = x.Id
)
DELETE tmp
  FROM x
  JOIN tmp ON tmp.Id = x.Id