user: Question: what is the lifespan when the imperial height is 7ft 8 in and the nationality is Fiji?
Columns: ['Nationality', 'Metric', 'Imperial', 'Name', 'Lifespan']
Types: ['text', 'text', 'text', 'text', 'text']
Sample row: ['United States', '2.72m', '8ft 11in', 'Robert Wadlow', '1918–1940']
SQL:

assistant: SELECT "Lifespan" FROM "Table" WHERE "Imperial" = '7ft 8 in' AND "Nationality" = 'Fiji';