Function in the select

Question

Hi
can someone please show me how to call a function from a select* statement.
Thanks
Helena

Answer 1

select age
from show_details
where age=func_test();
Here the function returns some value that function definition is like
CREATE OR REPLACE FUNCTION func_test RETURN NUMBER
AS
lv_a NUMBER;
BEGIN
lv_a := 0;
lv_a := lv_a + 1;
RETURN lv_a;
dbms_output.put_line(lv_a);
EXCEPTION
WHEN OTHERS THEN
dbms_output.put_line('Error is '||SQLERRM);
END;
This is to manually call a function
DECLARE
v_a NUMBER;
BEGIN
v_a := func_test();
dbms_output.PUT_LINE(v_a);
END;
************The o/p is '1'.
If the show_details table contains the age value as 1 then the field will be selected by calling the function.