sql server - Conditional CASE/IF in constructing T-SQL statement -

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i have query in front-end code i'm trying convert stored procedure. front-end code has conditional logic in construct correct sql based on form values. did not write original sql have been tasked conversion.

the issue i'm facing don't have enough knowledge/experience go doing this. have consulted these links help, don't quite me there:

sql: conditional statement in group clause

sql case statement specifiying condition in clause?

pseudo-code:

where b.active=1   , year(metric_year) = @frmyear  if @selorg not null , @selorg != 'all'      if @selorg = 'org1'        , org in('org1','org2','org3') , measure_id not in(0,1,2,3,4)      else        , org = @selorg else      , measure_id not in(0,1,2,3,4)

trying simple results in "incorrect syntax near end" error.

where b.active=1   , year(metric_year) = @frmyear     ,     case @selorg      when 'org1' org in('org1','org2','org3') , measure_id not in(0,1,2,3,4)     end

is want possible? if so, failing see?

you this:

where b.active=1 ,  year(metric_year) = @frmyear , (         (@selorg = 'org1' , org in('org1','org2','org3') , measure_id not in(0,1,2,3,4))     or  (@selorg = 'all')     )

depending on criteria going though may beneficial separate queries - 

if @selorg = 'org1'     begin          select  ...            table         b.active=1         ,  year(metric_year) = @frmyear            , org in('org1','org2','org3')          , measure_id not in(0,1,2,3,4);     end else if @selorg = 'all'     begin          select  ...            table         b.active=1         ,  year(metric_year) = @frmyear;     end

this may seem work, may improved performance.


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