user: Question: What was the year of the World Half Marathon Championships with a result of 3rd?
Columns: ['Year', 'Tournament', 'Venue', 'Result', 'Event']
Types: ['real', 'text', 'text', 'text', 'text']
Sample row: [1997.0, 'World Cross Country Championships', 'Turin , Italy', '25th', 'Long race']
SQL:

assistant: SELECT "Year" FROM "Table" WHERE "Tournament" = 'World Half Marathon Championships' AND "Result" = '3rd';