Tell me the sum of Gross Tonnage for isis ship on date commisioned less than 1842
CREATE TABLE table_name_94 (
    gross_tonnage INTEGER,
    ship VARCHAR,
    date_commissioned VARCHAR
)
SELECT SUM(gross_tonnage) FROM table_name_94 WHERE ship = "isis" AND date_commissioned < 1842
Below are sql tables schemas paired with instruction that describes a task. Using valid SQLite, write a response that appropriately completes the request for the provided tables. ### Instruction: Tell me the sum of Gross Tonnage for isis ship on date commisioned less than 1842 ### Input: CREATE TABLE table_name_94 (
    gross_tonnage INTEGER,
    ship VARCHAR,
    date_commissioned VARCHAR
) ### Response: SELECT SUM(gross_tonnage) FROM table_name_94 WHERE ship = "isis" AND date_commissioned < 1842