CREATE TABLE table_5170 ("Name" TEXT, "Pennant number" TEXT, "Ordered" FLOAT, "Builder" TEXT, "Commissioned" TEXT, "Fate" TEXT)

Sfax has a total ordered number of?
SELECT COUNT("Ordered") FROM table_5170 WHERE "Name" = 'sfax'
SELECT COUNT("Ordered") FROM "table_5170" WHERE "Name" = 'sfax'