Solve the following sql problem:
On what episode did Julia Roberts win the "Outstanding Guest Actress in a Drama Series" award during the 1999 Primetime Emmy Awards? Tell me her role.

Schema:
SCHEMA:
- Table: Episode
  - Column: episode_id
    - Samples: [tt0629204, tt0629228, tt0629170, tt0629266, tt0629149]
  - Column: series
    - Samples: [Law and Order, Law and Order, Law and Order, Law and Order, Law and Order]
  - Column: season
    - Samples: [9, 9, 9, 9, 9]
  - Column: episode
    - Samples: [1, 2, 3, 4, 5]
  - Column: number_in_series
    - Samples: [182, 183, 184, 185, 186]
  - Column: title
    - Samples: [Cherished, DWB, Bait, Flight, Agony]
  - Column: summary
    - Samples: [New assistant DA Abbie Carmichael aggressively investigates an infant'..., White police officers are accused of beating and dragging an African A..., A teenager who was shot in a drug deal gone bad claims to have been co..., Prosecutors have trouble making a case against a father accused of inj..., After a woman is brutally attacked, the police believe they have stumb... (truncated)]
  - Column: air_date
    - Samples: [1998-09-23, 1998-10-07, 1998-10-14, 1998-10-21, 1998-11-04]
  - Column: episode_image
    - Samples: [https://m.media-amazon.com/images/M/MV5BODFmZmI2YTgtN2Y2Mi00ODA1LThjOT..., https://m.media-amazon.com/images/M/MV5BNWEyM2NkZjktN2YwOS00ODMyLWI1Nz..., https://m.media-amazon.com/images/M/MV5BYzI5ZDU4NzUtYzE0My00MTE5LWE1Nz..., https://m.media-amazon.com/images/M/MV5BMmVlZWZlOWEtYjQ0MC00YmE5LTgwZG..., https://m.media-amazon.com/images/M/MV5BMzQ2ZmI1OGEtMDhkMi00NjM3LThlZW... (truncated)]
  - Column: rating
    - Samples: [7.9, 7.9, 7.6, 7.9, 8.2]
  - Column: votes
    - Samples: [203, 177, 159, 165, 187]
- Table: Keyword
  - Column: episode_id
    - Samples: [tt0629239, tt0629239, tt0629420, tt0629420, tt0629420]
  - Column: keyword
    - Samples: [nun, priest, police officer, police officer killed, police officer shot]
- Table: Person
  - Column: person_id
    - Samples: [nm0000210, nm0049569, nm0288886, nm0538744, nm0578294]
  - Column: name
    - Samples: [Julia Roberts, Rene Balcer, Billy Fox, Constantine Makris, Thomas Meloeny]
  - Column: birthdate
    - Samples: [1967-10-28, 1954-02-09, None, None, None]
  - Column: birth_name
    - Samples: [Julia Fiona Roberts, Rene Chenevert Balcer, None, None, None]
  - Column: birth_place
    - Samples: [Smyrna, Montreal, None, None, None]
  - Column: birth_region
    - Samples: [Georgia, Quebec, None, None, None]
  - Column: birth_country
    - Samples: [USA, Canada, None, None, None]
  - Column: height_meters
    - Samples: [1.73, None, None, None, None]
  - Column: nickname
    - Samples: [Jules, None, None, Gus, None]
- Table: Award
  - Column: award_id
    - Samples: [258, 259, 260, 261, 262]
  - Column: organization
    - Samples: [International Monitor Awards, International Monitor Awards, International Monitor Awards, International Monitor Awards, International Monitor Awards]
  - Column: year
    - Samples: [1999, 1999, 1999, 1999, 1999]
  - Column: award_category
    - Samples: [Monitor, Monitor, Monitor, Monitor, Monitor]
  - Column: award
    - Samples: [Film Originated Television Series - Best Achievement, Film Originated Television Series - Best Achievement, Film Originated Television Series - Best Achievement, Film Originated Television Series - Best Achievement, Film Originated Television Series - Best Achievement]
  - Column: series
    - Samples: [Law and Order, Law and Order, Law and Order, Law and Order, Law and Order]
  - Column: episode_id
    - Samples: [tt0629149, tt0629149, tt0629149, tt0629149, tt0629149]
  - Column: person_id
    - Samples: [nm0937725, nm0792309, nm0049569, nm0371065, nm0288886]
  - Column: role
    - Samples: [None, None, None, None, None]
  - Column: result
    - Samples: [Winner, Winner, Winner, Winner, Winner]
- Table: Credit
  - Column: episode_id
    - Samples: [tt0629204, tt0629204, tt0629204, tt0629204, tt0629204]
  - Column: person_id
    - Samples: [nm0226352, nm0506974, nm4103116, nm0645048, nm5632505]
  - Column: category
    - Samples: [Additional Crew, Additional Crew, Additional Crew, Additional Crew, Additional Crew]
  - Column: role
    - Samples: [technical advisor, production accountant, production accountant, president of NBC West Coast, executive assistant to executive producer]
  - Column: credited
    - Samples: [true, true, true, true, true]
- Table: Vote
  - Column: episode_id
    - Samples: [tt0629204, tt0629204, tt0629204, tt0629204, tt0629204]
  - Column: stars
    - Samples: [10, 9, 8, 7, 6]
  - Column: votes
    - Samples: [36, 39, 64, 35, 13]
  - Column: percent
    - Samples: [17.7, 19.2, 31.5, 17.2, 6.4]

SELECT T3.episode_id, T2.role FROM Person AS T1 INNER JOIN Award AS T2 ON T1.person_id = T2.person_id INNER JOIN Episode AS T3 ON T2.episode_id = T3.episode_id WHERE T2.year = 1999 AND T2.award = 'Outstanding Guest Actress in a Drama Series' AND T2.organization = 'Primetime Emmy Awards' AND T1.name = 'Julia Roberts' AND T2.result = 'Nominee'