How to write this query using correlation subquery or non exists clause

Question

-- Tables description.
--step-1- 4 employees present in EMP table.
--step-2- each employee having 1 country_no in EMP_DOCS table.3 employees having same country_no(i.e emp's 1,2,3)
--step-3- 1 emp document can have multiple items.In this case each employee having one each in the EMP_ITEMS table.
--step-4- 1 EMPLOYEE  can have Multiple Documents so we have a relation between EMP_ITEMS and DOCUMENT_ITEMS.whatever items present in EMP_ITEMS those items will be inserted into DOCUMENT_ITEMS.so we have a item-item relation.
--so we stored EMP_ITEMS id in EMP_ITEMS_REF_ID_1 of DOCUMENT_ITEMS table.
-- step-5- DOCUMENT-INVOICE has 1-1 relation once invoice is created we stored invoice id in DOCUMENT table.
--This is the requirement.Let's say in this example 3 employees are using same country_no and 4th employee is using another country_no
--which is not used by other 3 employees.
--Condtion-1:
--if all of the employees have created INVOICE which is using same country_no of different country_no then the query should display all records.
--Condition-2:
--if any one of the employee not created INVOICE which is using same country_no of other employees then remaining employees also should not come in the query
-- even though invoice is created by other employees.
--Condition-3:
--if any one of the employee not created even DOCUMENT  which is using same country_no of other employees then remaining employees also should not come in the query
-- even though invoice is created by other employees.
I hope I explain the conditions clearly.if you understand well by looking at the data i posted below may i know what is the final result should be displayed?
create table EMP
  ID       NUMBER not null,
  TYPE     VARCHAR2(1)
alter table EMP
  add constraint ID primary key (ID);
create table EMP_DOCS
  ID         NUMBER not null,
  EMP_ID     NUMBER,
  COUNTRY_NO VARCHAR2(15)
alter table EMP_DOCS
  add constraint PK_EMP_DT primary key (ID);
alter table EMP_DOCS
  add constraint FK_EMP_DT foreign key (EMP_ID)
  references EMP (ID);
create table EMP_ITEMS
  ID         NUMBER not null,
  EMP_DOC_ID     NUMBER
alter table EMP_ITEMS
  add constraint PK_EMP_ITEMS_DT primary key (ID);
alter table EMP_ITEMS
  add constraint FK_EMP_ITEMS_DT foreign key (EMP_DOC_ID)
  references EMP_DOCS (ID);
  create table DOCUMENT
  ID   NUMBER not null,
  DOCNO VARCHAR2(15),
  INVOICE_REF_1 NUMBER
alter table DOCUMENT
  add constraint DOC_PK_ID primary key (ID);
  create table DOCUMENT_ITEMS
  ID         NUMBER not null,
  DOC_ID     NUMBER,
  EMP_ITEMS_REF_ID_1    NUMBER
alter table DOCUMENT_ITEMS
  add constraint PK_DOCUMENT_ITEMS_DT primary key (ID);
alter table DOCUMENT_ITEMS
  add constraint FK_DOCUMENT_ITEMS_DT foreign key (DOC_ID)
  references DOCUMENT (ID);
create table INVOICE
  ID   NUMBER not null,
  INVOICE_NO VARCHAR2(15)
alter table INVOICE
  add constraint INVOICE_PK_ID primary key (ID);
  INSERT INTO EMP ( ID, TYPE ) VALUES (
1, 'A');
INSERT INTO EMP ( ID, TYPE ) VALUES (
2, 'A');
INSERT INTO EMP ( ID, TYPE ) VALUES (
3, 'A');
INSERT INTO EMP ( ID, TYPE ) VALUES (
4, 'A');
INSERT INTO EMP_DOCS ( ID, EMP_ID, COUNTRY_NO ) VALUES (
1, 1, 'INDIA');
INSERT INTO EMP_DOCS ( ID, EMP_ID, COUNTRY_NO ) VALUES (
2, 2, 'INDIA');
INSERT INTO EMP_DOCS ( ID, EMP_ID, COUNTRY_NO ) VALUES (
3, 3, 'INDIA');
INSERT INTO EMP_DOCS ( ID, EMP_ID, COUNTRY_NO ) VALUES (
4, 4, 'USA');
INSERT INTO EMP_ITEMS ( ID, EMP_DOC_ID ) VALUES (
1, 1);
INSERT INTO EMP_ITEMS ( ID, EMP_DOC_ID ) VALUES (
2, 2);
INSERT INTO EMP_ITEMS ( ID, EMP_DOC_ID ) VALUES (
3, 3);
INSERT INTO EMP_ITEMS ( ID, EMP_DOC_ID ) VALUES (
4, 4);
INSERT INTO DOCUMENT ( ID, DOCNO, INVOICE_REF_1 ) VALUES (
1, 'DOC1', 1);
INSERT INTO DOCUMENT ( ID, DOCNO, INVOICE_REF_1 ) VALUES (
2, 'DOC1', 2);
INSERT INTO DOCUMENT ( ID, DOCNO, INVOICE_REF_1 ) VALUES (
3, 'DOC3', 0);
INSERT INTO DOCUMENT ( ID, DOCNO, INVOICE_REF_1 ) VALUES (
4, 'DOC4', 3);
INSERT INTO DOCUMENT_ITEMS ( ID, DOC_ID, EMP_ITEMS_REF_ID_1 ) VALUES (
1, 1, 1);
INSERT INTO DOCUMENT_ITEMS ( ID, DOC_ID, EMP_ITEMS_REF_ID_1 ) VALUES (
2, 2, 2);
INSERT INTO DOCUMENT_ITEMS ( ID, DOC_ID, EMP_ITEMS_REF_ID_1 ) VALUES (
3, 2, 2);
INSERT INTO DOCUMENT_ITEMS ( ID, DOC_ID, EMP_ITEMS_REF_ID_1 ) VALUES (
4, 3, 3);
INSERT INTO DOCUMENT_ITEMS ( ID, DOC_ID, EMP_ITEMS_REF_ID_1 ) VALUES (
5, 4, 4);
INSERT INTO INVOICE ( ID, INVOICE_NO ) VALUES (
1, 'INV1');
INSERT INTO INVOICE ( ID, INVOICE_NO ) VALUES (
2, 'INV2');
INSERT INTO INVOICE ( ID, INVOICE_NO ) VALUES (
3, 'INV3');
commit;
-- I have written below query to satisfy above conditions but still required results are not coming..
SELECT *
  FROM EMP E
WHERE E.TYPE = 'A'
   AND NOT EXISTS (SELECT *
          FROM EMP_DOCS       EDOC1,
               EMP_DOCS       EDOC2,
               EMP            E1,
               EMP_ITEMS      EMPI,
               DOCUMENT_ITEMS DOCITM,
               DOCUMENT       DOC,
               INVOICE        INV
         WHERE EDOC1.EMP_ID = E.ID
           AND EDOC2.EMP_ID = E1.ID
           AND EDOC1.ID = EMPI.EMP_DOC_ID
           AND EDOC1.COUNTRY_NO = EDOC2.COUNTRY_NO
           AND EMPI.ID = DOCITM.EMP_ITEMS_REF_ID_1
           AND DOCITM.DOC_ID = DOC.ID
           AND INV.ID = DOC.INVOICE_REF_1);

Answer 1

DB version:oracle 10g;10.2