CREATE TABLE table_203_587 (id DECIMAL, "country" TEXT, "weapon designation" TEXT, "weapon description" TEXT, "year ( s )  delivered" TEXT, "quantity delivered" DECIMAL)

what is the total number of tanks sold by china to iraq ?
SELECT SUM("quantity delivered") FROM table_203_587 WHERE "weapon description" = 'tank' AND "country" = 'china'
SELECT SUM("quantity delivered") FROM "table_203_587" WHERE "country" = 'china' AND "weapon description" = 'tank'