Which Tankers have a Hazmat of , and Platforms of , and a Staffing of volunteer?
CREATE TABLE table_8400 (
    "Brigade" text,
    "Staffing" text,
    "Type" text,
    "Location" text,
    "Pumpers" real,
    "Tankers" real,
    "Telebooms" text,
    "Platforms" text,
    "Cars" text,
    "Hazmat" text
)
SELECT "Tankers" FROM table_8400 WHERE "Hazmat" = '–' AND "Platforms" = '–' AND "Staffing" = 'volunteer'
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: Which Tankers have a Hazmat of , and Platforms of , and a Staffing of volunteer? ### Input: CREATE TABLE table_8400 (
    "Brigade" text,
    "Staffing" text,
    "Type" text,
    "Location" text,
    "Pumpers" real,
    "Tankers" real,
    "Telebooms" text,
    "Platforms" text,
    "Cars" text,
    "Hazmat" text
) ### Response: SELECT "Tankers" FROM table_8400 WHERE "Hazmat" = '–' AND "Platforms" = '–' AND "Staffing" = 'volunteer'