Read only query help

Question

Hello,
I have read-only access to a database and I'm trying to perform a count on a decoded statement.
I cannot update, merge, create views, or delete at all.
example:
vdh.vin as VIN,
mcs.vehicle.veh_manuf_year@OCP5 as YEAR,
mcs.veh_make.veh_make_desc@OCP5 as MAKE,
vcbc.veh_model.veh_model_desc@OCP5 as MODEL,
vdh.created_timestamp as "TIMESTAMP",
max(to_char(decode(c.COMMAND_ID,'LT_FT_TR_PR',TRIM (TO_CHAR
(c.command_result, 'XXXXXXXXXXXXXXX')), ' '))) LF_TIRE_PRESSURE,
max(to_char(decode(c.COMMAND_ID,'RT_FT_TR_PR',TRIM (TO_CHAR
(c.command_result, 'XXXXXXXXXXXXXXX')), ' '))) RF_TIRE_PRESSURE,
max(to_char(decode(c.COMMAND_ID,'LT_RR_TR_PR',TRIM (TO_CHAR
(c.command_result, 'XXXXXXXXXXXXXXX')), ' '))) LR_TIRE_PRESSURE,
max(to_char(decode(c.COMMAND_ID,'RT_RR_TR_PR',TRIM (TO_CHAR
(c.command_result, 'XXXXXXXXXXXXXXX')), ' '))) RR_TIRE_PRESSURE,
max(to_char(decode(c.COMMAND_ID,'HIGH__PRESSURE_LIMIT',TRIM (TO_CHAR
(c.command_result, 'XXXXXXXXXXXXXXX')), ' '))) HI_LIMIT,
max(to_char(decode(c.COMMAND_ID,'LOW__PRESSURE_LIMIT',TRIM (TO_CHAR
(c.command_result, 'XXXXXXXXXXXXXXX')), ' '))) LO_LIMIT,
c.STATUS as STATUS,
dh.DTC_CODE as DTC_CODE,
dh.EXPLANATION_TEXT as DTC_EXPLANATION
from vdu.c2pt_data_history c, veh_diag_history vdh,
vdu.connected_veh_param cvp,
module_history mh, dtc_history dh,
mcs.vehicle@OCP5, mcs.veh_make@OCP5, vcbc.veh_model@OCP5,
vcbc.veh_manufacturer@OCP5
where ((c.VEH_DIAG_HISTORY_SAK = vdh.VEH_DIAG_HISTORY_SAK)
and (vdh.CASE_SAK = cvp.CASE_SAK)
and (dh.MODULE_HISTORY_SAK = mh.MODULE_HISTORY_SAK)
and (vdh.VEH_DIAG_HISTORY_SAK = mh.MODULE_HISTORY_SAK)
and (cvp.VEHICLE_SAK = vehicle.vehicle_sak@OCP5)
and (veh_make.veh_manuf@OCP5 = veh_model.veh_manuf@OCP5)
AND (veh_make.veh_make@OCP5 = veh_model.veh_make@OCP5)
AND (veh_manufacturer.veh_manuf@OCP5 = veh_model.veh_manuf@OCP5)
AND (veh_model.veh_manuf@OCP5 = vehicle.veh_manuf@OCP5)
AND (veh_model.veh_make@OCP5 = vehicle.veh_make@OCP5)
AND (veh_model.veh_model@OCP5 = vehicle.veh_model@OCP5)
AND (veh_model.veh_manuf_year@OCP5 = vehicle.veh_manuf_year@OCP5))
and c.CREATED_TIMESTAMP >= to_date ('10/20/2007 12:00:00 AM','MM/DD/YYYY
HH:MI:SS AM')
and c.CREATED_TIMESTAMP < to_date ('10/21/2007 12:00:00 AM','MM/DD/YYYY
HH:MI:SS AM')
group by vdh.vin, mcs.vehicle.veh_manuf_year@OCP5,
mcs.veh_make.veh_make_desc@OCP5,
vcbc.veh_model.veh_model_desc@OCP5, vdh.created_timestamp, c.STATUS,
dh.DTC_CODE,
dh.EXPLANATION_TEXT
order by vdh.created_timestamp
unfortunately it returns no data. I think there is a disconnect between table:dh and table:c
but my main problem is how do I add another column called count which counts from 0 through 4 what the return is on:
max(to_char(decode(c.COMMAND_ID,'LT_FT_TR_PR',TRIM (TO_CHAR
(c.command_result, 'XXXXXXXXXXXXXXX')), ' '))) LF_TIRE_PRESSURE,
max(to_char(decode(c.COMMAND_ID,'RT_FT_TR_PR',TRIM (TO_CHAR
(c.command_result, 'XXXXXXXXXXXXXXX')), ' '))) RF_TIRE_PRESSURE,
max(to_char(decode(c.COMMAND_ID,'LT_RR_TR_PR',TRIM (TO_CHAR
(c.command_result, 'XXXXXXXXXXXXXXX')), ' '))) LR_TIRE_PRESSURE,
max(to_char(decode(c.COMMAND_ID,'RT_RR_TR_PR',TRIM (TO_CHAR
(c.command_result, 'XXXXXXXXXXXXXXX')), ' '))) RR_TIRE_PRESSURE
all I need to know is whether or not 1 through 4 are null or not, if not, then set the value to 1 and then if null then the value is zero and cound 1 through 4 in the column called count_pressure.
the values may be anything from 1.23232 to 100000.00323.
I hope this makes sense.

Answer 1

Not sure if I understand your requirements but perhaps;
SQL> with t as (
   select 5 c1,5 c2,5 c3,5 c4 from dual union all
   select 5, 5, 5, null from dual union all
   select null, null, null, null from dual union all
   select null, null, 5, 5 from dual)
select
   nvl2(c1,1,0) +
   nvl2(c2,1,0) +
   nvl2(c3,1,0) +
   nvl2(c4,1,0) tot
from t
       TOT
         4
         3
         0
         2