Oracle query help

Question

Oracle9i Enterprise Edition Release 9.2.0.8.0 - 64bit Production
With the Partitioning, OLAP and Oracle Data Mining options
JServer Release 9.2.0.8.0 - Production
Report Builder 10.1.2.0.2
ORACLE Server Release 10.1.0.4.2
Oracle Procedure Builder 10.1.2.0.2
Oracle ORACLE PL/SQL V10.1.0.4.2 - Production
Oracle CORE    10.1.0.4.0    Production
Oracle Tools Integration Services 10.1.2.0.2
Oracle Tools Common Area 10.1.2.0.2
Oracle Toolkit 2 for Windows 32-bit platforms 10.1.2.0.2
Resource Object Store 10.1.2.0.2
Oracle Help 10.1.2.0.2
Oracle Sqlmgr 10.1.2.0.2
Oracle Query Builder 10.1.2.0.2 - Production
PL/SQL Editor (c) WinMain Software (www.winmain.com), v1.0 (Production)
Oracle ZRC 10.1.2.0.2
Oracle XML Developers Kit 10.1.0.4.2 - Production
Oracle Virtual Graphics System 10.1.2.0.2
Oracle Image 10.1.2.0.2
Oracle Multimedia Widget 10.1.2.0.2
Oracle Tools GUI Utilities 10.1.2.0.2
I have enclosed sample data and also table structure. I need help in getting the query.
select dept_id,proc_code,override_goal,goal_override_date
  from table2
where goal_override_date between '02-jan-2014' and '11-jan-2014'
   and dept_id = 10
   and proc_code = 'CP'
select DEPT_ID, PROC_CODE, DAY_SUNDAY, DAY_MONDAY,
       DAY_TUESDAY, DAY_WEDNESDAY, DAY_THURSDAY,
         DAY_FRIDAY, DAY_SATURDAY
  from table1
where dept_id =10
and proc_code = 'CP'; 
Table1  is kind of maintenance table.
In Table2 values can be overridden.
Requirement
Check to see if there is data in table 2 for the date range . If table2 has no value then take value from table1 for that day the date falls into. Any more clarification please ask me.
Sundays are all zeros.
I want this data. and the sum for the date range.
2-jan-2014  - 3
3-jan-2014  - 3
4-jan-2014  - 3
5-jan-2014  - 0
6-jan-2014  - 1
7-jan-2014  - 3
8-jan-2014  - 5
9-jan-2014  - 5
10-jan-2014 - 3
11-jan-2014 - 3
Sum for the date range has to be 29
Sample table and data
CREATE TABLE TABLE1
  DEPT_ID NUMBER NOT NULL,
  PROC_CODE VARCHAR2(2 BYTE) NOT NULL,
  DAY_SUNDAY NUMBER(4) NOT NULL,
  DAY_MONDAY NUMBER(4) NOT NULL,
  DAY_TUESDAY NUMBER(4) NOT NULL,
  DAY_WEDNESDAY NUMBER(4) NOT NULL,
  DAY_THURSDAY NUMBER(4) NOT NULL,
  DAY_FRIDAY NUMBER(4) NOT NULL,
  DAY_SATURDAY NUMBER(4) NOT NULL
Insert into TABLE1
  (DEPT_ID, PROC_CODE, DAY_SUNDAY, DAY_MONDAY, DAY_TUESDAY,
  DAY_WEDNESDAY, DAY_THURSDAY, DAY_FRIDAY, DAY_SATURDAY)
Values
  (10, 'CP', 0, 3, 3,
  3, 3, 3, 3);
COMMIT;
CREATE TABLE TABLE2
  DEPT_ID NUMBER NOT NULL,
  PROC_CODE VARCHAR2(2 BYTE) NOT NULL,
  OVERRIDE_GOAL NUMBER(4),
  GOAL_OVERRIDE_DATE DATE NOT NULL
Insert into TABLE2
  (DEPT_ID, PROC_CODE, OVERRIDE_GOAL, GOAL_OVERRIDE_DATE)
Values
  (10, 'CP', 1, TO_DATE('01/06/2014 00:00:00', 'MM/DD/YYYY HH24:MI:SS'));
Insert into TABLE2
  (DEPT_ID, PROC_CODE, OVERRIDE_GOAL, GOAL_OVERRIDE_DATE)
Values
  (10, 'CP', 3, TO_DATE('01/07/2014 00:00:00', 'MM/DD/YYYY HH24:MI:SS'));
Insert into TABLE2
  (DEPT_ID, PROC_CODE, OVERRIDE_GOAL, GOAL_OVERRIDE_DATE)
Values
  (10, 'CP', 5, TO_DATE('01/08/2014 00:00:00', 'MM/DD/YYYY HH24:MI:SS'));
Insert into TABLE2
  (DEPT_ID, PROC_CODE, OVERRIDE_GOAL, GOAL_OVERRIDE_DATE)
Values
  (10, 'CP', 5, TO_DATE('01/09/2014 00:00:00', 'MM/DD/YYYY HH24:MI:SS'));
Insert into TABLE2
  (DEPT_ID, PROC_CODE, OVERRIDE_GOAL, GOAL_OVERRIDE_DATE)
Values
  (10, 'CP', 3, TO_DATE('01/10/2014 00:00:00', 'MM/DD/YYYY HH24:MI:SS'));
Insert into TABLE2
  (DEPT_ID, PROC_CODE, OVERRIDE_GOAL, GOAL_OVERRIDE_DATE)
Values
  (10, 'CP', 3, TO_DATE('01/11/2014 00:00:00', 'MM/DD/YYYY HH24:MI:SS'));
COMMIT;
Help is highly appreciated.

Answer 1

SELECT dates,
       override_goal,
       SUM(override_goal) OVER()
       FROM(SELECT dates,
                   CASE WHEN EXISTS(SELECT 1
                                    FROM table2 t2
                                    WHERE t2.goal_override_date = qry1.dates
                                    AND t2.dept_id = 10
                                    AND t2.proc_code = 'CP')
                        THEN (SELECT override_goal
                              FROM table2 t2
                              WHERE t2.goal_override_date = qry1.dates
                              AND t2.dept_id = 10
                              AND t2.proc_code = 'CP')
                   ELSE (SELECT DECODE(days,'SUN',day_sunday,
                                            'MON',day_monday,
                                            'TUE',day_tuesday,
                                            'WED',day_wednesday,
                                            'THU',day_thursday,
                                            'FRI',day_friday,
                                            'SAT',day_saturday )
                          FROM table1)
                   END as override_goal
            FROM (SELECT in_dt1+(LEVEL-1) dates,
                         TO_CHAR(in_dt1+(LEVEL-1),'DY') days
                  FROM(SELECT TO_DATE(&from_date,'DD-MON-YYYY') in_dt1,
                              TO_DATE(&to_date,'DD-MON-YYYY') in_dt2
                             FROM dual)
                  CONNECT BY LEVEL <= (in_dt2 - in_dt1)+1) qry1);
Now run the query it will prompt you for the inputs. You can pass the date values and check the result. Otherwise replace &from_date,&to_date with user inputs