Writing a Case When statement with two conditions

I am trying to write a Case When statement with two conditions.  In addition it has to be a MAX value since I am grouping everything by a field.

I have tried the code:

Max(Case When InsOrd=1 then When PtBal=Balance then 0 else Balance end) as InsBal1,
Max(Case when InsOrd =2 then when PtBal =Balance then 0 else Balance end) as InsBal2,
max(Case when InsOrd =3 then When PtBal=Balance then 0 else Balance end) as InsBal3,


I get errors that the WHEN is not correct.

The Balance  or Zero value should output to InsBal1,2,3 depending on the InsOrd value.

Thanks

Glen
GPSPOWAsked:
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Jim HornMicrosoft SQL Server Developer, Architect, and AuthorCommented:
If you have two WHENs, you'll need two THENs (which you have) and two ENDs (which you only have one.  

Try this
Max(Case When InsOrd=1 then When PtBal=Balance then 0 else Balance end else 0 end) as InsBal1,

Also, I wrote an article on SQL Server CASE Solutions, where halfway down it shows an example of a nested CASE statement.
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David KrollCommented:
Max(
Case
  When InsOrd=1 then
    case
      When PtBal=Balance then 0
      else Balance
    end
   else 0
end) as InsBal1
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pcelbaCommented:
Interesting... I've post an answer a few hours ago but it seems to be lost in the universe... OK, here it is again.

AND operator is simpler than two nested CASE WHEN structures:

Max(Case When InsOrd=1 AND PtBal=Balance then 0 else Balance end) as InsBal1,
Max(Case when InsOrd =2 AND PtBal =Balance then 0 else Balance end) as InsBal2,
max(Case when InsOrd =3 AND PtBal=Balance then 0 else Balance end) as InsBal3,
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GPSPOWAuthor Commented:
Thanks to all.

Everyone of the solutions are viable for my project.

Glen
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