Using decode for range of data

Question

hi experts
i want to dicode distance which are between
1 to 50
51 to 100
101 to 150
i am using this query but it is giving some error
please tell me that how should solve this problem
select a.fr_wh,a.to_wh,nvl(a.distance,0) distance,
DECODE(a.distance,(select distance from evhdist_mst where distance between 0 and 50) , 25,
                              (select distance from evhdist_mst where distance between 0 and 100) , 50,                         
               100) cost,
b.rkpt_name "Source" , c.party_name "Destination"
from
evhdist_mst a,
evm_rkpt b,
evm_rkpt_wh d,
evm_party c
where
a.to_wh=c.party_cd
and a.fr_wh=d.wh_cd
and b.rkpt_cd=d.rkpt_cd
and (substr(a.TO_WH,1,6) = 'NPAM01')
AND b.rkpt_cd IN( 'NPAM0101','NPAM0102','NPAM0103')
and to_wh='NPAM01028'
thanks in advance
regards
manoj

Answer 1

This is your formatted code.
select a.fr_wh,
       a.to_wh,
       nvl(a.distance,0) distance,
       DECODE(a.distance,(select distance from evhdist_mst where distance between 0 and 50) , 25,
                         (select distance from evhdist_mst where distance between 0 and 100), 50, /*Should this be 0 to 100 or 51 to 100? */
              100) cost, /* In place of this, you need to have a CASE */
       b.rkpt_name "Source" ,
       c.party_name "Destination"
from evhdist_mst a,
     evm_rkpt b,
     evm_rkpt_wh d,
     evm_party c
where a.to_wh=c.party_cd
and a.fr_wh=d.wh_cd
and b.rkpt_cd=d.rkpt_cd
and (substr(a.TO_WH,1,6) = 'NPAM01')
AND b.rkpt_cd IN( 'NPAM0101','NPAM0102','NPAM0103')
and to_wh='NPAM01028'Like this
case when a.distance >= 0 and a.distance <= 50 then 25
     when a.distance >= 51 and a.distance <= 100 then 50
     else 100
end cost More over your scalar sub-query is not correct. It may result in more than one row and may fail during run-time.
Cheers
Sarma.