user: Question: what is the metlink code that opened in 1908?
Columns: ['Station', 'Metlink code', 'Line(s)', 'Service(s)', 'Serves', 'km from Wellington', 'Fare zone(s)', 'Opened']
Types: ['text', 'text', 'text', 'text', 'text', 'text', 'text', 'text']
Sample row: ['Awarua Street', 'AWAR', 'Johnsonville Line', 'Johnsonville', 'Ngaio', '6.0', '3', '2 Cannot handle non-empty timestamp argument! 1938']
SQL:

assistant: SELECT "Metlink code" FROM "Table" WHERE "Opened" = '1908';