Help Required for date display & mutating trigger

Question

Hai all..
I need clarification for 2 problems.
Problem 1
Is there a possibility to display the values with a date range.
I mean if there is no data for a particular date within the given range. it should display some null value.
Eg.
table name : sample
Sno Date1 Name desgn
1 1-may-2004 xyz engr
1 3-may-2004 xyz engr-1
1 4-may-2004 xyz engr-2
The query is
select * from sample where date1 between '01-may-2004' and '04-may-2004'.
The result of query will be
Sno Date1 Name desgn
1 1-may-2004 xyz engr
1 3-may-2004 xyz engr-1
1 4-may-2004 xyz engr-2
But i need the result to be displayed as
Sno Date1 Name desgn
1 1-may-2004 xyz engr
nil 2-may-2004 nil nil
1 3-may-2004 xyz engr-1
1 4-may-2004 xyz engr-2
Pls let me know how to achieve this.
Problem 2:
While i am updating a value using a trigger.
I am getting "mutating" error.
Is there a possibility to avoid the mutation.
The two triggers i am using is
Trigger 1
CREATE OR REPLACE TRIGGER TRIG_DURATION_UPDATED
AFTER UPDATE ON
TIMESHEET_DATA
FOR EACH ROW
DECLARE
ID_COUNT DATE;
A date;
NN NUMBER;
AA NUMBER;
NN1 NUMBER;
BEGIN
b_dur :=0;
IF UPDATING('PROGRESS') THEN
SELECT COUNT(1) INTO AA FROM TIMESHEET_DATA_PAUSE WHERE DATA_sNO = :OLD.DATA_SNO AND EMP_ID = :OLD.EMP_ID AND
ACNUM = :OLD.ACNUM AND DURATION IS NULL;
IF AA > 0 THEN
SELECT to_date(START_TIME,'DD-MON-YYYY HH:MI AM') into a FROM TIMESHEET_dATA_PAUSE WHERE
EMP_ID = :NEW.EMP_ID AND ACNUM = :new.acnum AND DATA_SNO = :new.data_sno AND pause_TIME IS NULL
AND DURATION IS NULL;
select to_date(sysdate,'DD-MON-YYYY HH:MI AM') into id_count from dual;
SELECT A - ID_COUNT INTO NN FROM DUAL;
SELECT round(TRUNC(NN*24),2) INTO NN1 FROM DUAL;
UPDATE TIMESHEET_dATA_PAUSE SET DURATION = NN1,PAUSE_TIME = SYSDATE WHERE
EMP_ID = :NEW.EMP_ID AND ACNUM = :new.acnum
AND DATA_SNO = :new.data_sno AND pause_TIME IS NULL AND DURATION IS NULL;
END IF;
END IF;
END;
Trigger 2
CREATE OR REPLACE TRIGGER TRIG_DURATION_UPDATED_PAUSE
AFTER UPDATE ON
TIMESHEET_DATA_PAUSE
FOR EACH ROW
DECLARE
ID_COUNT DATE;
A_COUNT NUMBER(10);
A date;
NN NUMBER;
AA NUMBER;
NN1 NUMBER(10,2);
BEGIN
IF UPDATING('DURATION') THEN
SELECT COUNT(1) INTO A_COUNT FROM TIMESHEET_DATA WHERE DATA_sNO = :new.data_sno AND EMP_ID =:new.EMP_ID
AND ACNUM = 'ACNUM' AND DURATION IS NULL;
IF A_COUNT >0 THEN
SELECT NVL(SUM(DURATION),0) INTO NN1 FROM TIMESHEET_DATA_PAUSE WHERE DATA_sNO = :new.data_sno AND EMP_ID =:new.EMP_ID AND ACNUM = :NEW.ACNUM;
UPDATE TIMESHEET_DATA SET DURATION = NN1 WHERE DATA_sNO = :new.data_sno AND EMP_ID =:new.EMP_ID AND ACNUM = :NEW.ACNUM AND DURATION IS NULL;
END IF;
END IF;
EXCEPTION WHEN DUP_VAL_ON_INDEX THEN
DBMS_OUTPUT.PUT_LINE ('CANNOT INSERT');
END;
Pls let me know the solutions for the two..
Thanks in Advance
Gaya3

Answer 1

In future please start two threads when you have two questions to ask. Othewise it makes things difficult to follow and may well lead to some of your questions not getting an answer. Unlike some other sites there is no limit to the number of posts we can have :)
To answer your first question:
If you have Oracle9i you can do this using a PIPELINED function to act as a pivot table (in earlier versions you will have to have a table of some description - ALL_OBJECTS will do in a pinch).
CREATE OR REPLACE TYPE t_dates AS TABLE OF DATE
CREATE OR REPLACE FUNCTION f_dates
  (st IN DATE, cnt IN INTEGER) RETURN t_dates
  PIPELINED
AS
  dd date;
BEGIN
  FOR a IN 1..cnt LOOP
    SELECT  st + (a-1)
      INTO  dd
      FROM  dual;
    PIPE ROW (dd);
  END LOOP;
  RETURN;
END f_dates;
/So, given this data...
SQL> select * from t57
  2  /
      COL1 COL2
         3 05-MAY-04
         4 06-MAY-04
         5 07-MAY-04
         6 12-MAY-04
         8 15-MAY-04
5 rows selected.
SQL>...we can run this query...
SQL> SELECT nvl(to_char(t.col1), 'Nil'), dd.ndate
  2  FROM   t57 t
  3         , ( select column_value AS ndate from table(cast(f_dates(trunc(SYSDATE), 11) AS t_dates))) dd
  4  WHERE trunc(dd.ndate) = trunc(t.col2(+))
  5  /
NVL(TO_CHAR(T.COL1),'NIL')               NDATE
3                                        05-MAY-04
4                                        06-MAY-04
5                                        07-MAY-04
Nil                                      08-MAY-04
Nil                                      09-MAY-04
Nil                                      10-MAY-04
Nil                                      11-MAY-04
6                                        12-MAY-04
Nil                                      13-MAY-04
Nil                                      14-MAY-04
8                                        15-MAY-04
11 rows selected.
SQL> Obviously, you will want to tidy up the function to suit your needs.
Cheers, APC