How to combine these two SQL statements?

Question

I have 2 SQL queries both of which get the counts for different IDs.

select @cntCM_CMQ = count(*)
from dbo.CaseWorkflow cw 
join vew_CasePersonnelSystemIDs         


        

Answer 1

There's a trick to doing this. essentially you use Case to pick out a 1 value for the rows you are interested in and then Sum the ones to get a count. Case defaults to null if no cases match, which get ignored by Sum

Select
  @cntCM_CMQ = Sum(Case ws.ID_WorkflowType When 3 Then 1 End),
  @cntCM_PRWK = Sum(Case ws.ID_WorkflowType When 1 Then 1 End) 
From
  dbo.CaseWorkflow cw 
    inner join 
  vew_CasePersonnelSystemIDs vcps 
    on cw.ID_Case = vcps.ID_Case
    inner join 
  dbo.WorkflowStates ws 
    on ws.ID_WorkflowState = cw.ID_WorkflowState
Where
  CMSUID = @nSUID