What was the sum of ranks of those called Fernando Cavenaghi who appeared less than 7.
CREATE TABLE table_31898 (
    "Rank" real,
    "Name" text,
    "Team" text,
    "Goals" real,
    "Appearances" real
)
SELECT SUM("Rank") FROM table_31898 WHERE "Name" = 'fernando cavenaghi' AND "Appearances" < '7'
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 was the sum of ranks of those called Fernando Cavenaghi who appeared less than 7. ### Input: CREATE TABLE table_31898 (
    "Rank" real,
    "Name" text,
    "Team" text,
    "Goals" real,
    "Appearances" real
) ### Response: SELECT SUM("Rank") FROM table_31898 WHERE "Name" = 'fernando cavenaghi' AND "Appearances" < '7'