How to eliminate null values from the data?

Question

This query displays data for a project with approval & submission dates...I'm trying to eliminate records that have null values in Approval & submission date columns at the same time. But rather keep the records that have atleast one submission date or approval date?
SELECT distinct QP.QIP_id,
        Max(decode( Upper(QP.Status_CD), Upper('Approved') , Effective_date, null ))  as Approved_date,
        Max( decode( Upper(QP.Status_CD), Upper('Submitted') , Effective_date, null ) ) as Submitted_date
         FROM  Llp_Sys.Project_Status QP
         WHERE SYSDATE >= qp.effective_date
            AND (qp.terminated_date IS NULL OR SYSDATE < qp.terminated_date)
        GROUP by QP.QIP_ID,Qp.Status_CD
        order by QP.QIP_ID

Answer 1

francislazaro wrote:
This query displays data for a project with approval & submission dates...I'm trying to eliminate records that have null values in Approval & submission date columns at the same time. But rather keep the records that have atleast one submission date or approval date?
SELECT distinct QP.QIP_id,
Max(decode( Upper(QP.Status_CD), Upper('Approved') , Effective_date, null ))  as Approved_date,
Max( decode( Upper(QP.Status_CD), Upper('Submitted') , Effective_date, null ) ) as Submitted_date
FROM  Llp_Sys.Project_Status QP
WHERE SYSDATE >= qp.effective_date
AND (qp.terminated_date IS NULL OR SYSDATE < qp.terminated_date)
GROUP by QP.QIP_ID,Qp.Status_CD
order by QP.QIP_ID
based on my assumption, will the following not work ? if so then post some sample data and expected output (simplify as much as possible)
SELECT *
  FROM (SELECT DISTINCT qp.qip_id,
                        MAX(DECODE(UPPER(qp.status_cd),
                                   UPPER('Approved'), effective_date,
                                   NULL
                                  )) AS approved_date,
                        MAX(DECODE(UPPER(qp.status_cd),
                                   UPPER('Submitted'), effective_date,
                                   NULL
                                  )) AS submitted_date
                   FROM llp_sys.project_status qp
                  WHERE SYSDATE >= qp.effective_date
                    AND (   qp.terminated_date IS NULL
                         OR SYSDATE < qp.terminated_date
               GROUP BY qp.qip_id, qp.status_cd
               ORDER BY qp.qip_id)
WHERE approved_date IS NOT NULL OR submitted_date IS NOT NULL;Edited by: Clearance 6`- 8`` on Jul 9, 2010 12:46 PM