How to pick max value from a column of a table using cursor and iteration

Question

Hello Everybody
I have a table loan_detail
and a column in it loan_amount
now i want to pick values from this table using cursor and then by using iteration i want to pick max value from it using that cursor
here is my table
LOAN_AMOUNT
100
200
300
400
500
5600
700i was able to do it using simple loop concepts but when i was trying to do this by using cursor i was not able to do it .
Regards
Peeyush

Answer 1

SQL> SELECT MAX(sal) Highest_Sal,MIN(sal) Lowest_Sal FROM emp;
HIGHEST_SAL LOWEST_SAL
       5000        800
SQL> set serverout on
SQL> DECLARE
  2    TYPE tmp_tbl IS TABLE OF NUMBER INDEX BY BINARY_INTEGER;
  3    sal_tbl tmp_tbl;
  4    CURSOR emp_sal IS
  5      SELECT sal FROM emp;
  6    counter INTEGER := 1;
  7  BEGIN
  8    FOR i IN emp_sal LOOP
  9      sal_tbl(i.sal) := counter;
10      counter := counter + 1;
11    END LOOP;
12    DBMS_OUTPUT.put_line('Lowest SAL:' || sal_tbl.FIRST);
13    DBMS_OUTPUT.put_line('Highest SAL:' || sal_tbl.LAST);
14  END;
15  /
Lowest SAL:800
Highest SAL:5000
PL/SQL procedure successfully completed.
SQL> Even smaller
SQL> DECLARE
  2    TYPE tmp_tbl IS TABLE OF NUMBER INDEX BY BINARY_INTEGER;
  3    sal_tbl tmp_tbl;
  4    CURSOR emp_sal IS
  5      SELECT sal FROM emp;
  6    counter INTEGER := 1;
  7  BEGIN
  8    FOR i IN emp_sal LOOP
  9      sal_tbl(i.sal) := 1;
10    END LOOP;
11    DBMS_OUTPUT.put_line('Lowest SAL:' || sal_tbl.FIRST);
12    DBMS_OUTPUT.put_line('Highest SAL:' || sal_tbl.LAST);
13  END;
14  /
Lowest SAL:800
Highest SAL:5000
PL/SQL procedure successfully completed.
SQL> Edited by: Saubhik on Jan 5, 2011 4:41 PM