user: Question: What character was portrayed by the same actor for 12 years on Neighbours?
Columns: ['Actor', 'Character', 'Soap Opera', 'Years', 'Duration']
Types: ['text', 'text', 'text', 'text', 'text']
Sample row: ['Ray Meagher', 'Alf Stewart', 'Home and Away', '1988—', '26 years']
SQL:

assistant: SELECT "Character" FROM "Table" WHERE "Duration" = '12 years' AND "Soap Opera" = 'Neighbours';