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11.07.2008 at 02:54AM PST, ID: 23884757
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9.5

how to better the below query

Asked by chaituu in Oracle Database, Oracle 9.x, SQL Query Syntax

I want to check whether employees(1,2) country's same or not.if same following query will fetch true otherwise nothing will come.below query is working as expected.i suspect that we can  better that query.why i suspect that do i need to pass values in subquery also? am i right or wrong?any other way writing the same query?i think using exists also we can write this query.
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SELECT distinct 'true' FROM EMPLOYEE EMP 
WHERE 
ID IN(1,2)  AND
1 = ( SELECT COUNT(DISTINCT COUNTRY) 
FROM  EMPLOYEE_PACKS EMPK 
WHERE EMPK.EMP_ID IN(1,2) 
);
 
CREATE TABLE EMPLOYEE
(
  ID			NUMBER NOT NULL ,
  EMPNO          VARCHAR2(10)
 
);
 
alter table EMPLOYEE
  add constraint EMP_PK primary key (ID);
  
INSERT INTO EMPLOYEE(ID,EMPNO) VALUES(1,'EMP1');
INSERT INTO EMPLOYEE(ID,EMPNO) VALUES(2,'EMP2');
INSERT INTO EMPLOYEE(ID,EMPNO) VALUES(3,'EMP3');
 
create table EMPLOYEE_PACKS
(
  ID     NUMBER not null,
  EMP_ID NUMBER,
  COUNTRY              VARCHAR2(20)    
);
 
alter table EMPLOYEE_PACKS
  add constraint EMPCS_PK primary key (ID);
 
alter table EMPLOYEE_PACKS
  add constraint EMPCS_FK foreign key (EMP_ID)
  references EMPLOYEE (ID);
 
INSERT INTO EMPLOYEE_PACKS(ID,EMP_ID,COUNTRY) VALUES(1,1,'A');
INSERT INTO EMPLOYEE_PACKS(ID,EMP_ID,COUNTRY) VALUES(2,1,'A');
INSERT INTO EMPLOYEE_PACKS(ID,EMP_ID,COUNTRY) VALUES(3,1,'A');
 
INSERT INTO EMPLOYEE_DOCS(ID,EMP_ID,COUNTRY) VALUES(4,2,'B');
INSERT INTO EMPLOYEE_DOCS(ID,EMP_ID,COUNTRY) VALUES(5,2,'B');
INSERT INTO EMPLOYEE_DOCS(ID,EMP_ID,COUNTRY) VALUES(6,1,'A');
INSERT INTO EMPLOYEE_DOCS(ID,EMP_ID,COUNTRY) VALUES(7,3,'C');
INSERT INTO EMPLOYEE_DOCS(ID,EMP_ID,COUNTRY) VALUES(8,3,'C');
[+][-]11.07.2008 at 03:33AM PST, ID: 22903401

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About this solution

Zones: Oracle Database, Oracle 9.x, SQL Query Syntax
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Solution Provided By: sujith80
Participating Experts: 3
Solution Grade: A
 
 
[+][-]11.07.2008 at 04:45AM PST, ID: 22903776

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[+][-]11.07.2008 at 05:16AM PST, ID: 22903973

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[+][-]11.07.2008 at 05:26AM PST, ID: 22904026

Often, when Experts are collaborating with members who have asked questions, they will request additional information about the problem. Askers respond with an author comment like this one.

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[+][-]11.07.2008 at 07:31AM PST, ID: 22905246

At Experts Exchange, members can ask their questions to thousands of technology professionals, also known as Experts. Experts compete and collaborate to answer those questions by leaving comments like this one.

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[+][-]11.07.2008 at 08:32AM PST, ID: 22905990

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