Question

I would like to know if I have this SQL logic decoded correctly. Here is the the SQL:

,[hrs].[Hours] - SUM(CASE WHEN [UnitState].[UnitStateType] <> 'ACTIVE' THEN [Allocation].[AllocatedEnergyMwh] ELSE 0 END / CAST([Unit].[NetDependableCapacity] AS FLOAT)) AS SH

I interpret this as saying:

if [UnitState].[UnitStateType] does not equal active then SH equals the sum of [Allocation].[AllocatedEnergyMwh] / 
    (float)[Unit].[NetDependableCapacity].  

else SH = [hrs].[Hours] 

Answer 1

Not exactly.

There is no else for SH. The else only affects the sum aggregate. More accurately, it says:

SH = hours -
 (the sum of AllocatedEnergyMwh where StateType != ACTIVE) / NetDependableCapacity

The else is only used to ignore the active AllocatedEnergyMwh in the sum. It does this by setting AllocatedEnergyMwh = 0 in those cases.