How to shows result as Alias name.

Question

Dear All,
I am having following query and output, in that inside query showing one record check another query, that result i want to show as Alias, Can we show result as alias ?
          select SPL.speciality_description,Emp.FIRSTNAME,DT.full_date                                   
          ,max(decode(diagnosis_description,                                   
          (SELECT DIAGNOSIS_DESCRIPTION                                   
          FROM (SELECT row_number() OVER (ORDER BY DIAGNOSIS_DESCRIPTION DESC) r,                                   
          DG.DIAGNOSIS_DESCRIPTION                                   
          FROM A_PERFORMANCEDOCTORWISE PD                                   
          INNER JOIN D_DATE DT ON DT.DATE_ID = PD.DATEID                                   
          INNER JOIN D_DIAGNOSIS DG ON DG.DIAGNOSISID = PD.DIAGNOSISID                                   
     WHERE DT.FULL_DATE between (select TO_CHAR(sysdate-15,'DD/MON/YYYY') from dual)                                         
     and (select TO_CHAR(sysdate,'DD/MON/YYYY') from dual) and ROWNUM < 6                                         
          ) WHERE r=1),patientcount)) as First                                   
          ,max(decode(diagnosis_description,                                   
          (SELECT DIAGNOSIS_DESCRIPTION FROM (                                   
          SELECT row_number() OVER (ORDER BY DIAGNOSIS_DESCRIPTION DESC) r,                                   
          DG.DIAGNOSIS_DESCRIPTION                                   
          FROM A_PERFORMANCEDOCTORWISE PD                                   
          INNER JOIN D_DATE DT ON DT.DATE_ID = PD.DATEID                                   
          INNER JOIN D_DIAGNOSIS DG ON DG.DIAGNOSISID = PD.DIAGNOSISID                                   
     WHERE DT.FULL_DATE between (select TO_CHAR(sysdate-15,'DD/MON/YYYY') from dual)                                         
     and (select TO_CHAR(sysdate,'DD/MON/YYYY') from dual) and ROWNUM < 6                                         
          ) WHERE r=2),patientcount)) as Second                                   
          ,max(decode(diagnosis_description,                                   
          (SELECT DIAGNOSIS_DESCRIPTION FROM (                                   
          SELECT row_number() OVER (ORDER BY DIAGNOSIS_DESCRIPTION DESC) r,                                   
          DG.DIAGNOSIS_DESCRIPTION                                   
          FROM A_PERFORMANCEDOCTORWISE PD                                   
          INNER JOIN D_DATE DT ON DT.DATE_ID = PD.DATEID                                   
          INNER JOIN D_DIAGNOSIS DG ON DG.DIAGNOSISID = PD.DIAGNOSISID                                   
          WHERE DT.FULL_DATE between (select TO_CHAR(sysdate-15,'DD/MON/YYYY') from dual)                                    
     and (select TO_CHAR(sysdate,'DD/MON/YYYY') from dual) and ROWNUM < 6                                         
          ) WHERE r=3),patientcount)) as Third                                   
          ,max(decode(diagnosis_description,                                   
          (SELECT DIAGNOSIS_DESCRIPTION FROM (                                   
          SELECT row_number() OVER (ORDER BY DIAGNOSIS_DESCRIPTION DESC) r,                                   
          DG.DIAGNOSIS_DESCRIPTION                                   
          FROM A_PERFORMANCEDOCTORWISE PD                                   
          INNER JOIN D_DATE DT ON DT.DATE_ID = PD.DATEID                                   
          INNER JOIN D_DIAGNOSIS DG ON DG.DIAGNOSISID = PD.DIAGNOSISID                                   
          WHERE DT.FULL_DATE between (select TO_CHAR(sysdate-15,'DD/MON/YYYY') from dual)                                    
     and (select TO_CHAR(sysdate,'DD/MON/YYYY') from dual) and ROWNUM < 6                                         
          ) WHERE r=4),patientcount)) as Forth                                   
          ,max(decode(diagnosis_description,                                   
          (SELECT DIAGNOSIS_DESCRIPTION FROM (                                   
          SELECT row_number() OVER (ORDER BY DIAGNOSIS_DESCRIPTION DESC) r,                                   
          DG.DIAGNOSIS_DESCRIPTION                                   
          FROM A_PERFORMANCEDOCTORWISE PD                                   
          INNER JOIN D_DATE DT ON DT.DATE_ID = PD.DATEID                                   
          INNER JOIN D_DIAGNOSIS DG ON DG.DIAGNOSISID = PD.DIAGNOSISID                                   
          WHERE DT.FULL_DATE between (select TO_CHAR(sysdate-15,'DD/MON/YYYY') from dual)                                    
     and (select TO_CHAR(sysdate,'DD/MON/YYYY') from dual) and ROWNUM < 6                                         
          ) WHERE r=5),patientcount)) as Fifth
          FROM A_PERFORMANCEDOCTORWISE PD                                   
          INNER JOIN D_SPECIALITY SPL ON SPL.SPECIALITYID = PD.SPECIALITYID                                   
          INNER JOIN D_EMPLOYEEMASTER EMP ON EMP.EMPID = PD.DOCTORID                                   
          INNER JOIN D_DATE DT ON DT.DATE_ID = PD.DATEID                                   
          INNER JOIN D_DIAGNOSIS DG ON DG.DIAGNOSISID = PD.DIAGNOSISID                                   
          WHERE DT.FULL_DATE between (select TO_CHAR(sysdate-15,'DD/MON/YYYY') from dual)                                    
          and (select TO_CHAR(sysdate,'DD/MON/YYYY') from dual)                                    
          group by SPL.speciality_description, Emp.FIRSTNAME, DT.full_date                                   
          order by SPL.speciality_description,Emp.FIRSTNAME,DT.full_date                                   
Output:
REGISTRATION     Dr.POOJA     19-JUL-10 12:00 AM     56     74     99     32     96
REGISTRATION     Dr.POOJA     21-JUL-10 12:00 AM     93     74     45     43     69
REGISTRATION     Dr.POOJA     22-JUL-10 12:00 AM     34     34     76     66     24
REGISTRATION     Dr.POOJA     24-JUL-10 12:00 AM     99     75     97     78     69
REGISTRATION     Dr.POOJA     26-JUL-10 12:00 AM     54     34     76     66     24
REGISTRATION     Dr.POOJA     28-JUL-10 12:00 AM     76     75     97     78     33
REGISTRATION     Dr.POOJA     30-JUL-10 12:00 AM     54     23     34     65     23
Travel Clinic     Dr.PRAN     19-JUL-10 12:00 AM     56     74     99     32     96
Travel Clinic     Dr.PRAN     21-JUL-10 12:00 AM     93     74     45     43     69
Anothe Query :
SELECT DIAGNOSIS_DESCRIPTION                                   
          FROM (SELECT row_number() OVER (ORDER BY DIAGNOSIS_DESCRIPTION DESC) r,                                   
          DG.DIAGNOSIS_DESCRIPTION                                   
          FROM A_PERFORMANCEDOCTORWISE PD                                   
          INNER JOIN D_DATE DT ON DT.DATE_ID = PD.DATEID                                   
          INNER JOIN D_DIAGNOSIS DG ON DG.DIAGNOSISID = PD.DIAGNOSISID                                   
     WHERE DT.FULL_DATE between (select TO_CHAR(sysdate-15,'DD/MON/YYYY') from dual)                                         
     and (select TO_CHAR(sysdate,'DD/MON/YYYY') from dual) and ROWNUM < 6                                         
          ) WHERE r=1
Output:
Neurocytoma
I want to show this result as Alias name. Can anybody tell me how to do that ?
Thanks and Regard's
Harish Patil

Answer 1

Hi,
If I've understood the intention of your code correctly, you are trying to pivot the rows into columns and assign a "nice" header to the resulting columns.
You cannot dynamically assign a column name to a pivoted row. You need to know beforehand what row you are pivoting so you can assign a column name to it. This isn't as difficult as it sounds, there are a number of ways you could know what row will become what column.
Since I have no way to test using your code, I am posting an example for you that uses the EMP table that is part of the standard example databases shipped with Oracle.
Also, notice that, the code I am presenting is enclosed between the tags (which you cannot see) [ code ] and [ / code ] which is why it appears nicely formatted. Your code would be much easier to read and folks would be much more likely to understand what you want and therefore help you if you take the time to format your code so it is comprehensible.
See the basics of using tags to format your code at this page:
http://wiki.oracle.com/page/Oracle+Discussion+Forums+FAQ
Now the example that will help you get what you want:
/* this query calculates the total salaries per deptno */
SELECT job,
       deptno,
       sum(sal) sal
  FROM emp
GROUP BY job, deptno;
/* output is */
JOB          SUM(SAL)
CLERK            4150
SALESMAN         5600
PRESIDENT        5000
MANAGER          8275
ANALYST          6000
/* this query pivots the above query (which is what you're trying to do) */
SELECT *
  FROM (
        SELECT job,
               deptno,
               sum(sal) sal
          FROM emp
         GROUP BY job, deptno
  PIVOT (sum(sal) FOR deptno IN (10, 20, 30, 40));
/* output is */
     CLERK   SALESMAN  PRESIDENT    MANAGER    ANALYST
      4150       5600       5000       8275       6000If you are not using 11g, there are ways of doing the above without using the PIVOT clause. There are lots of examples in this forum on how to pivot rows. Here is one that pretty much does manually what the PIVOT clause does:
select max(case when job='CLERK'
                then ename else null end) as clerks,
       max(case when job='ANALYST'
                then ename else null end) as analysts,
       max(case when job='MANAGER'
                then ename else null end) as mgrs,
       max(case when job='PRESIDENT'
                then ename else null end) as prez,
       max(case when job='SALESMAN'
                then ename else null end) as sales
from (
select job,
      ename,
      row_number()over(partition by job order by ename) rn
from emp
      ) x
group by rn
/* outputs */
     CLERKS  ANALYSTS  MGRS   PREZ  SALES
     MILLER  FORD      CLARK  KING  TURNER
     JAMES   SCOTT     BLAKE        MARTIN
     ADAMS             JONES        WARD
     SMITH                          ALLENHTH,
John.
Edited by: 440bx - 11gR2 on Aug 2, 2010 9:28 AM - added missing verb "is" in sentence
Edited by: 440bx - 11gR2 on Aug 2, 2010 9:32 AM - missing "s" in select.