Oracle SQL how to call created function

Question

I made a function in Oracle that calculates the distance between two points (x1,y1) and (x2,y2) ,here it is:

CREATE OR REPLACE FUNCTION afstand_cart (x1 IN number, x2 IN number, y1 IN number, y2 IN number)
RETURN number IS
BEGIN
return sqrt((x2-x1)*(x2-x1) + (y2-y1)*(y2-y1));
END;

Now how do I call this function?

SELECT afstand_cart(0,0,1,1) FROM dual  

Doesn't work.

Answer 1

The syntax in Oracle is to use call :

CALL afstand_cart(0,0,1,1)

see here