sql server 2008 r2 - Sum values of column on a row with null values in the same column -


i have below query generates following table. wonder if there way replace null-value in column "rate" sum(yieldportion) 5 currencies includes data every position date? preferable in case-clause generates "rate".

positiondate|   currency |  yield   |   ratename    |   rate    |   yieldportion 2017-03-27  |   dkk      |  -7,0    |   cibor_3m    |   -24,750 |   -0,058 2017-03-27  |   eur      |  -21,2   |   euribor_3m  |   -33,000 |   -0,069 2017-03-27  |   nok      |  138,6   |   nibor_3m    |   94,000  |   0,114 2017-03-27  |   sek      |  5,5     |   stibor_3m   |   -49,100 |   -0,195 2017-03-27  |   usd      |  122,8   |   libor_3m    |   115,130 |   0,045 2017-03-27  |   portfolio|  18,5    |   benchmark   |   null    |   null 2017-03-24  |   dkk      |  -7,1    |   cibor_3m    |   -24,750 |   -0,056 2017-03-24  |   eur      |  -21,1   |   euribor_3m  |   -33,000 |   -0,068 2017-03-24  |   nok      |  139,4   |   nibor_3m    |   96,000  |   0,118 2017-03-24  |   sek      |  6,1     |   stibor_3m   |   -49,900 |   -0,201 2017-03-24  |   usd      |  122,3   |   libor_3m    |   115,680 |   0,046 2017-03-24  |   portfolio|  18,6    |   benchmark   |   null    |   null

.

select         yld.positiondate,         yld.currency,         yld.yield,         'ratename'          = case when yld.currency = 'portfolio' 'portfoliobenchmark' else intr.ratename + '_3m' end,         'rate'              = case when yld.currency <> 'portfolio' intr.mid*100 else null end,         'yieldportion'= ssi.mvweight*intr.mid                position.tbl_yield2 yld             left join position.vw_interestrates intr             on yld.currency = intr.currency             , yld.positiondate = intr.ratedate             , intr.ratename '%ibor%'             , intr.timeband = '3 months'              left join --below query calculates each currency's portion of portfolio's market value             (             select                 mvc.positiondate,                 currency,                 mvccy/mvportfolio mvweight                                    (                 select --calculation of mv / currency                     positiondate,                     currency,                     'mvccy' = sum(mvcleanccy*spot)                 position.vw_positions                  instrumentgroup not in ('overnight deposit', 'foreign exchange')                       group positiondate, currency                 )mvc                 inner join                     (select -- calculation of mv portfolio                         positiondate,                         'mvportfolio' = sum(mvcleanccy*spot)                     position.vw_positions                     instrumentgroup not in ('overnight deposit', 'foreign exchange')                               group positiondate                     )mvp                     on mvc.positiondate = mvp.positiondate             ) ssi             on ssi.positiondate = yld.positiondate , ssi.currency = yld.currency


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