user: Question: When is the winner Olympiacos, the venue is Georgios Karaiskakis Stadium and the runner-up is Iraklis?
Columns: ['Year', 'Winner', 'Runner-up', 'Score', 'Venue']
Types: ['text', 'text', 'text', 'text', 'text']
Sample row: ['8 June 1947', 'Olympiacos', 'Iraklis', '5–0', 'Apostolos Nikolaidis Stadium']
SQL:

assistant: SELECT "Year" FROM "Table" WHERE "Winner" = 'Olympiacos' AND "Venue" = 'Georgios Karaiskakis Stadium' AND "Runner-up" = 'Iraklis';