What is the 1979 number for Standing Rock Indian Reservation when the 1989 is less than 54.9?
CREATE TABLE table_47910 (
    "Reservation" text,
    "Location" text,
    "1969" real,
    "1979" real,
    "1989" real,
    "2000" real
)
SELECT SUM("1979") FROM table_47910 WHERE "Reservation" = 'standing rock indian reservation' AND "1989" < '54.9'
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: What is the 1979 number for Standing Rock Indian Reservation when the 1989 is less than 54.9? ### Input: CREATE TABLE table_47910 (
    "Reservation" text,
    "Location" text,
    "1969" real,
    "1979" real,
    "1989" real,
    "2000" real
) ### Response: SELECT SUM("1979") FROM table_47910 WHERE "Reservation" = 'standing rock indian reservation' AND "1989" < '54.9'