user: Question: Which season has the Celtic club?
Columns: ['Season', 'Competition', 'Round', 'Club', '1st leg']
Types: ['text', 'text', 'text', 'text', 'text']
Sample row: ['1957–58', 'European Cup', 'Preliminary Round', 'Manchester United', '0–6']
SQL:

assistant: SELECT "Season" FROM "Table" WHERE "Club" = 'Celtic';