What is the sum of NGC numbers for Constellation vela?
CREATE TABLE table_name_16 (
    ngc_number INTEGER,
    constellation VARCHAR
)
SELECT SUM(ngc_number) FROM table_name_16 WHERE constellation = "vela"
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 sum of NGC numbers for Constellation vela? ### Input: CREATE TABLE table_name_16 (
    ngc_number INTEGER,
    constellation VARCHAR
) ### Response: SELECT SUM(ngc_number) FROM table_name_16 WHERE constellation = "vela"