CREATE TABLE table_69788 ("Name" TEXT, "Years" TEXT, "Gender" TEXT, "Area" TEXT, "Authority" TEXT, "Decile" FLOAT, "Roll" FLOAT)

What is the sum of the roll with an area of Waikaka?
SELECT SUM("Roll") FROM table_69788 WHERE "Area" = 'waikaka'
SELECT SUM("Roll") FROM "table_69788" WHERE "Area" = 'waikaka'