CREATE TABLE table_78335 ("NGC number" FLOAT, "Object type" CLOB, "Constellation" CLOB, "Right ascension  (  J2000  ) " CLOB, "Declination  (  J2000  ) " CLOB, "Apparent magnitude" FLOAT)

What is the sum of NGC numbers for Constellation vela?
SELECT SUM("NGC number") FROM table_78335 WHERE "Constellation" = 'vela'
SELECT SUM("NGC number") FROM "table_78335" WHERE "Constellation" = 'vela'