user: Question: What date did Ian Poulter become runner up?
Columns: ['Date', 'Tournament', 'Winning score', 'Margin of victory', 'Runner(s)-up']
Types: ['text', 'text', 'text', 'text', 'text']
Sample row: ['20 Jan 2008', 'Abu Dhabi Golf Championship', '–15 (66-65-68-74=273)', '4 strokes', 'Henrik Stenson , Lee Westwood']
SQL:

assistant: SELECT "Date" FROM "Table" WHERE "Runner(s)-up" = 'Ian Poulter';