valor da coluna em uma única linha

SELECT
  p.name,
  MAX(CASE t.phonetype WHEN 'work' THEN t.phoneno END) AS workphone,
  MAX(CASE t.phonetype WHEN 'home' THEN t.phoneno END) AS homephone,
  MAX(CASE t.phonetype WHEN 'mob' THEN t.phoneno END) AS mobilephone
FROM people p
  INNER JOIN phones t ON p.Id = t.Id
GROUP BY p.Id, p.Name

SELECT
  p.name,
  w.phoneno AS workphone,
  h.phoneno AS homephone,
  m.phoneno AS mobilephone
FROM people p
  LEFT JOIN phones w ON p.Id = w.Id AND w.phonetype = 'work'
  LEFT JOIN phones h ON p.Id = h.Id AND h.phonetype = 'home'
  LEFT JOIN phones m ON p.Id = m.Id AND m.phonetype = 'mob'