CREATE TABLE table_51103 ("Owner" CLOB, "Class" CLOB, "Number in class" FLOAT, "Road numbers" CLOB, "Built" CLOB)

What is the total number in class for the Whitehaven Coal?
SELECT SUM("Number in class") FROM table_51103 WHERE "Owner" = 'whitehaven coal'
SELECT SUM("Number in class") FROM "table_51103" WHERE "Owner" = 'whitehaven coal'