sql - how to update multiple values null using multiple case statements -


this table:

site_name | date& time              | poweroutput          ----------+-------------------------+------------------ act0001   | 2013-07-21 01:00:00.000 | 196.852984494331    act0001   | 2013-07-21 02:00:00.000 |   0    xyz0001   | 2013-07-21 03:00:00.000 | 196.852984494331    xyq0001   | 2013-07-21 04:00:00.000 | 196.958395639561  xys0001   | 2013-07-21 05:00:00.000 |   0 xyd0001   | 2013-07-21 06:00:00.000 | 197.20098185022  xye0001   | 2013-07-21 07:00:00.000 |   0  xyg0001   | 2013-07-21 08:00:00.000 |   0      cfg0001   | 2013-07-21 09:00:00.000 | 197.412144323522  acb0001   | 2013-07-21 10:00:00.000 |   0  bdf0001   | 2013-07-21 11:00:00.000 |   0  olk0001   | 2013-07-21 12:00:00.000 | 196.886233049016

i have table , trying update values in places of "zero's". if there 1 0 able update table, if there consecutive zero's finding difficult update table.

the logic :

  • ((previous value-next value)/previous value)*100 <5

    if true should insert previous value

  • ((previous value-next value)/previous value)*100 >=5

    if true should remain zero.

this code have far:

with cte (     select           *,         lead(pr_output,1) on (order (select null)) previousvalue,         lag(pr_output,1) on (order (select null)) nextvalue             [dbo].[mytable] ) ,ctee (     select          *,         abs((previousvalue*100-nextvalue*100)/nextvalue) checkflag             cte  ) select     site_name,[date&time],     case          when pr_output <>0 pr_output         else             case                  when checkflag >= 5 0                 else previousvalue             end     end pr_output      ctee

the error getting

divide 0 error encountered.

please tell me doing wrong. if alternate way of doing through?

any appreciated.

output should be:

site_name | date& time              | poweroutput          ----------+-------------------------+------------------ act0001   | 2013-07-21 01:00:00.000 | 196.852984494331    act0001   | 2013-07-21 02:00:00.000 | 196.852984494331    xyz0001   | 2013-07-21 03:00:00.000 | 196.852984494331    xyq0001   | 2013-07-21 04:00:00.000 | 196.958395639561  xys0001   | 2013-07-21 05:00:00.000 | 196.958395639561 xyd0001   | 2013-07-21 06:00:00.000 | 197.20098185022  xye0001   | 2013-07-21 07:00:00.000 |   0  xyg0001   | 2013-07-21 08:00:00.000 |   0      cfg0001   | 2013-07-21 09:00:00.000 | 197.412144323522  acb0001   | 2013-07-21 10:00:00.000 |   0 bdf0001   | 2013-07-21 11:00:00.000 |   0  olk0001   | 2013-07-21 12:00:00.000 | 196.886233049016

need check if nextvalue 0 before dividing it..

hope solves problem.

with cte (     select           *,         lead(pr_output,1) on (order (select null)) previousvalue,         lag(pr_output,1) on (order (select null)) nextvalue             [dbo].[mytable] ) ,ctee (     select          *,         abs((previousvalue*100-nextvalue*100)/(case when nextvalue = 0 1 else nextvalue end)) checkflag             cte  ) select     site_name,[date&time],     case          when pr_output <>0 pr_output         else             case                  when checkflag >= 5 0                 else previousvalue             end     end pr_output      ctee

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