user: Question: Which Season has a Postseason of Promoted Runner-up?
Columns: ['Season', 'Tier', 'Division', 'Pos.', 'Postseason', 'Cup Competitions']
Types: ['text', 'real', 'text', 'real', 'text', 'text']
Sample row: ['1996–97', 4.0, '1ª División', 1.0, 'Promoted', '–']
SQL:

assistant: SELECT "Season" FROM "Table" WHERE "Postseason" = 'Promoted Runner-up';