Column data restriction based on join condition

Question

All,
SELECT e.ename,
  d.dname,
  e.job,
  e.comm, e.sal
FROM emp e,
  dept d
WHERE e.deptno=d.deptno
AND e.empno   =7788
AND e.comm   IS NOT NULL;
In this query, if the comm for the empno=7788 is not null, then i am able to retrive the record, If comm is not null, display the entire record along with comm details, if it is null, display the entire record without comm value(may be as null).
If commission is not null, then display the entire record, if it is null, then for e.comm, e.sal I want to display null values.
PS: I am in a situtation like this kind of. Kindly give me some idea.
Thanks

Answer 1

Thank you Frank and Sorry for not so clear in explanation.
SQL> desc demois_wo_routing
Name                                      Null?    Type
ORG_ID                                             NUMBER
ASSIGNED_TO                                        VARCHAR2(10)
COMMENTS                                           VARCHAR2(55)
DUE_DATE                                           DATE
ENTER_DATE                                NOT NULL DATE               -- is the APPROVED_DATE
ENTER_USER                                         VARCHAR2(30)       -- is the APPROVER_NAME
PRIORITY                                           NUMBER
START_DATE                                         DATE
STATUS                                    NOT NULL VARCHAR2(10)
WO_NUMBER                                 NOT NULL VARCHAR2(10)
SQL> desc demois_sr_routing
Name                                      Null?    Type
ORG_ID                                             NUMBER
ASSIGNED_TO                                        VARCHAR2(10)
COMMENTS                                           VARCHAR2(55)
DUE_DATE                                           DATE
ENTER_DATE                                NOT NULL DATE
ENTER_USER                                         VARCHAR2(30)
PRIORITY                                           NUMBER
REQ_NUMBER                                NOT NULL VARCHAR2(10)
START_DATE                                         DATE
STATUS                                    NOT NULL VARCHAR2(10)
SQL> select enter_user,wo_number,enter_Date,status from demois_wo_routing where wo_number='WO000853';
ENTER_USER                     WO_NUMBER  ENTER_DAT STATUS
E60075334                      WO000853   14-MAY-13 APPROVED
C10000001                      WO000853   09-APR-13 OPEN
C10000001                      WO000853   09-APR-13 ASSIGNED
E60075373                      WO000853   09-APR-13 PND APPRVL
SQL> select enter_user,req_number,enter_date,status from demois_sr_routing where req_number=(select req_number from demois_req where wo_number='WO000853');
ENTER_USER                     REQ_NUMBER ENTER_DAT STATUS
E60075373                      SR000818   09-APR-13 SCHEDULED
E60075334                      SR000818   14-MAY-13 SCHEDULED
C10000001                      SR000818   09-APR-13 SCHEDULED
C10000001                      SR000818   09-APR-13 SCHEDULED
SQL> SELECT fm.first_name || ' ' || fm.last_name AS approver_name,
  2         fpc.communication_value AS approver_cell
  3    FROM demo_person fm, demo_person_communication fpc
  4   WHERE fm.person_code = 'E60075334'   --ENTER_USER from FSR/ FWR table
  5     AND fm.person_id = fpc.person_id
  6     AND fpc.communication_type = 'Telephone';
APPROVER_NAME
APPROVER_CELL
Nicy Varghese
44952937
SQL> SELECT fm.first_name || ' ' || fm.last_name AS approver_name,
  2         fpc.communication_value AS approver_cell
  3    FROM demo_person fm, demo_person_communication fpc
  4   WHERE fm.person_code =
  5                         (SELECT enter_user
  6                            FROM demois_wo_routing
  7                           WHERE wo_number = 'WO000853' AND status = 'APPROVED')
  8     AND fm.person_id = fpc.person_id
  9     AND fpc.communication_type = 'Telephone';
APPROVER_NAME
APPROVER_CELL
Nicy Varghese
44952937
ACTUAL QUERY :---- If i run the below query i will definitely get a record of WO_NUMBER along with the other details.
SELECT   w.wo_number,
         DECODE (NVL (p.print_wo_barcode_flag, 'N'),
                 'Y', '*' || w.wo_number || '*',
                 NULL
                ) barcode_wo_number,
         INITCAP (w.maint_type) maint_type, INITCAP (w.wo_status) wo_state,
         w.priority, w.modify_date, w.start_date, w.due_date,
         INITCAP (w.description) description, w.method, w.crew,
         INITCAP (w.craft) craft, w.assigned_to, w.est_hours,
         DECODE (w.req_type,
                 'S', 'Service',
                 'P', 'PM',
                 'W', 'Project',
                 'T', 'Standing WO'
                ) req_type,
         w.req_number, INITCAP (w.requestor) requestor, w.telephone,
         w.mail_code, w.department, w.cp_number, w.site, w.building,
         NVL (w.phase, 0) phase, w.FLOOR, w.room, w.equipment,
         INITCAP (w.close_comments) close_comments, w.alt_requestor,
         w.alt_telephone, w.alt_department, w.alt_mail_code, w.schedule_user,
         DECODE (w.equipment,
                 NULL, NULL,
                 '*' || w.equipment || '*'
                ) equip_barcode,
         INITCAP (e.NAME) employee_name, w.schedule_date, w.pl_number,
         INITCAP (q.nomenclature) nomenclature, INITCAP (q.mfr) mfr,
         INITCAP (w.nonavailable_time) nonavailable_time, w.enter_user,
         a.asset_class_code, INITCAP (a.description) asset_class_description
    FROM demois_emp e,
         demois_equip q,
         demois_req w,
         demois_fmm_config p,
         demois_asset_class a
   WHERE w.wo_number IS NOT NULL
     AND NVL (w.asset_type, 'N') = 'N'
     AND w.equipment = q.equipment(+)
     AND w.assigned_to = e.employee(+)
     AND (w.assigned_to = :p_assigned_to OR :p_assigned_to IS NULL)
     AND (   (:p_marked_to_print = 'Y' AND w.print_ticket = 'Y')
          OR (:p_wo_number IS NOT NULL)
     AND (w.site = :p_site OR :p_site IS NULL)
     AND (w.crew = :p_crew OR :p_crew IS NULL)
     AND (w.craft = :p_craft OR :p_craft IS NULL)
     AND (w.maint_type = :p_maint_type OR :p_maint_type IS NULL)
     AND (w.req_type LIKE NVL (:p_req_type, '%'))
     AND (w.wo_number LIKE NVL (:p_wo_number, '%'))
     AND q.asset_class_id = a.asset_class_id(+)
ORDER BY wo_number;
The above is the sample data for my logic. The last one is the original query which am modifying with the tables listed above. The last query will return a record based on WO_NUMBER. Now i have to passing the WO_NUMBER to FWR table checking whether it is in APPROVED status or not. If not need to in FSR table with the associated SR ( req_number) for that WO_NUMBER.
If there is a record in 'APPROVED' state, need to display the approver name from FP and FPC tables by passing value of the ENTER_USER from FSR /  FWR. Till now it is fine , if the STATUS is 'APPROVED'.
The problem here is, there may a situation where the WO_NUMBER ( or respective SR number) will not be in 'APPROVED' status in both the tables. In this case also i need to get the record as usual like if i run the last query (ACTUAL QUERY).
There is no direct relation between the FSR and FWR tables here. Only DEMOIS_REQ table has REQ_NUMBER (SR000818) and WO_NUMBER ( WO000853 ).
Again sorry, If i am not clear enough.
Thanks in advance.