user: Question: What is the nickname at the University of Nebraska at Omaha?
Columns: ['Institution', 'Location', 'Team Nickname', 'Years', 'New Conference', 'New Classification']
Types: ['text', 'text', 'text', 'text', 'text', 'text']
Sample row: ['Augustana College', 'Rock Island, Illinois', 'Vikings', '2002-2011', 'Independent', 'NCAA Division III']
SQL:

assistant: SELECT "Team Nickname" FROM "Table" WHERE "Institution" = 'University of Nebraska at Omaha';