Problem while using inline view.

Question

hello everyone, i have a certain problem. i have a query where i have used 3 inline views.which is as follow.
SELECT X.MC_ID,
X.PROD,X.EFF,Y.PROD,Y.EFF,Z.PROD,Z.EFF
FROM
(SELECT A.MC_ID MC_ID,A.COARSE_FINE,DECODE(A.COARSE_FINE,'F',NVL(A.PRODUCTION,0),0) PROD,
DECODE(A.COARSE_FINE,'F',(NVL(A.PRODUCTION,0)/NVL(A.FINE_TARGET_PROD,0))* 100,0) EFF
FROM PR_DAILY_DOFFING_ENTRY A
WHERE A.SHIFT = 'A'
AND MC_ID = 24
AND TO_CHAR(A.DOFFING_DATE,'DD/MM/RRRR') = '28/10/2004') X,
(SELECT A.MC_ID,A.COARSE_FINE,DECODE(A.COARSE_FINE,'F',NVL(A.PRODUCTION,0),0) PROD,
DECODE(A.COARSE_FINE,'F',(NVL(A.PRODUCTION,0)/NVL(A.FINE_TARGET_PROD,0))* 100,0) EFF
FROM PR_DAILY_DOFFING_ENTRY A
WHERE A.SHIFT = 'B'
AND MC_ID = 24
AND TO_CHAR(A.DOFFING_DATE,'DD/MM/RRRR') = '28/10/2004') Y,
(SELECT A.MC_ID,A.COARSE_FINE,DECODE(A.COARSE_FINE,'F',NVL(A.PRODUCTION,' '),' ') PROD,
DECODE(A.COARSE_FINE,'F',(NVL(A.PRODUCTION,' ')/NVL(A.FINE_TARGET_PROD,' '))* 100,' ') EFF
FROM PR_DAILY_DOFFING_ENTRY A
WHERE A.SHIFT = 'C'
AND MC_ID = 24
AND TO_CHAR(A.DOFFING_DATE,'DD/MM/RRRR') = '28/10/2004') Z
Now my problem is that the view z is returning null as results in the prod and eff coloums.( well that is fine since i actually have no datas in my table against shift 'C') but inline views x and y are returning datas. but when i am selecting this -- SELECT X.MC_ID,
X.PROD,X.EFF,Y.PROD,Y.EFF,Z.PROD,Z.EFF nothing is being returned as all the coloums are showing null values. when it should show values in (X.PROD,X.EFF,Y.PROD,Y.EFF) coloumns and null in (Z.PROD,Z.EFF) coloumns. please suggest me what to do now.
Edited by: pari kankaria on Aug 23, 2009 11:02 PM

Answer 1

is this your complete query? I guess you are missing the joining conditions if this is your complete query.
it should be like this
SELECT x.mc_id, x.prod, x.eff, y.prod, y.eff, z.prod, z.eff
  FROM (SELECT a.mc_id mc_id, a.coarse_fine,
               DECODE (a.coarse_fine, 'F', NVL (a.production, 0), 0) prod,
               DECODE (a.coarse_fine,
                       'F', (  NVL (a.production, 0)
                             / NVL (a.fine_target_prod, 0)
                        * 100,
                       0
                      ) eff
          FROM pr_daily_doffing_entry a
         WHERE a.shift = 'A'
           AND mc_id = 24
           AND TO_CHAR (a.doffing_date, 'DD/MM/RRRR') = '28/10/2004') x,
       (SELECT a.mc_id, a.coarse_fine,
               DECODE (a.coarse_fine, 'F', NVL (a.production, 0), 0) prod,
               DECODE (a.coarse_fine,
                       'F', (  NVL (a.production, 0)
                             / NVL (a.fine_target_prod, 0)
                        * 100,
                       0
                      ) eff
          FROM pr_daily_doffing_entry a
         WHERE a.shift = 'B'
           AND mc_id = 24
           AND TO_CHAR (a.doffing_date, 'DD/MM/RRRR') = '28/10/2004') y,
       (SELECT a.mc_id, a.coarse_fine,
               DECODE (a.coarse_fine,
                       'F', NVL (a.production, ' '),
                      ) prod,
               DECODE (a.coarse_fine,
                       'F', (  NVL (a.production, ' ')
                             / NVL (a.fine_target_prod, ' ')
                        * 100,
                      ) eff
          FROM pr_daily_doffing_entry a
         WHERE a.shift = 'C'
           AND mc_id = 24
           AND TO_CHAR (a.doffing_date, 'DD/MM/RRRR') = '28/10/2004') z
WHERE x.mc_id = y.mc_id AND y.mc_id = z.mc_id     ----something like this should be there change it according to your conditionNOTE : NOT TESTED
Edited by: Qwerty on Aug 24, 2009 11:46 AM