sql group by calculated column

jackjohnson44
jackjohnson44 used Ask the Experts™
on
Hi, how can I group by a calculated column?  I am trying to do what is below and it is not working.

select
 case  when StartingIv >= 0 and StartingIv < 0.1 then '0-0.1'
 when StartingIv >= 0.1 and StartingIv < 0.2 then '0.1-0.2'
 when StartingIv >= 0.2 and StartingIv < 0.3 then '0.2-0.3'
 when StartingIv >= 0.3 and StartingIv < 0.4 then '0.3-0.4'
 when StartingIv >= 0.4 and StartingIv < 0.5 then '0.4-0.5'
 when StartingIv >= 0.5 and StartingIv < 0.6 then '0.5-0.6'
 when StartingIv >= 0.6 and StartingIv < 0.7 then '0.6-0.7'
 when StartingIv >= 0.7 and StartingIv < 0.8 then '0.7-0.8'
 when StartingIv >= 0.8 and StartingIv < 0.9 then '0.8-0.9'
 when StartingIv >= 0.9 and StartingIv < 1 then '0.9-1'
 when StartingIv >= 1 and StartingIv < 1.1 then '1-1.1'
 else 'ELSE'
 end as IvRange
 , Profit
 from  Trades
 group by IvRange
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Habib PourfardSoftware Developer
Top Expert 2012
Commented:
you need to write case again in group by clause:

select
 case  when StartingIv >= 0 and StartingIv < 0.1 then '0-0.1' 
 when StartingIv >= 0.1 and StartingIv < 0.2 then '0.1-0.2'
 when StartingIv >= 0.2 and StartingIv < 0.3 then '0.2-0.3'
 when StartingIv >= 0.3 and StartingIv < 0.4 then '0.3-0.4'
 when StartingIv >= 0.4 and StartingIv < 0.5 then '0.4-0.5'
 when StartingIv >= 0.5 and StartingIv < 0.6 then '0.5-0.6'
 when StartingIv >= 0.6 and StartingIv < 0.7 then '0.6-0.7'
 when StartingIv >= 0.7 and StartingIv < 0.8 then '0.7-0.8'
 when StartingIv >= 0.8 and StartingIv < 0.9 then '0.8-0.9'
 when StartingIv >= 0.9 and StartingIv < 1 then '0.9-1'
 when StartingIv >= 1 and StartingIv < 1.1 then '1-1.1'
 else 'ELSE'
 end as IvRange
 , Profit
 from  Trades
 group by  case  when StartingIv >= 0 and StartingIv < 0.1 then '0-0.1' 
 when StartingIv >= 0.1 and StartingIv < 0.2 then '0.1-0.2'
 when StartingIv >= 0.2 and StartingIv < 0.3 then '0.2-0.3'
 when StartingIv >= 0.3 and StartingIv < 0.4 then '0.3-0.4'
 when StartingIv >= 0.4 and StartingIv < 0.5 then '0.4-0.5'
 when StartingIv >= 0.5 and StartingIv < 0.6 then '0.5-0.6'
 when StartingIv >= 0.6 and StartingIv < 0.7 then '0.6-0.7'
 when StartingIv >= 0.7 and StartingIv < 0.8 then '0.7-0.8'
 when StartingIv >= 0.8 and StartingIv < 0.9 then '0.8-0.9'
 when StartingIv >= 0.9 and StartingIv < 1 then '0.9-1'
 when StartingIv >= 1 and StartingIv < 1.1 then '1-1.1'
 else 'ELSE'
 end

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Commented:
it is not clear why do you nned in this query group by"  - maybe you need  SELECT DISTINCT  instead of group by



but you can try:

--------------------
select
a.*
FROM
(

select
 case  when StartingIv >= 0 and StartingIv < 0.1 then '0-0.1'
 when StartingIv >= 0.1 and StartingIv < 0.2 then '0.1-0.2'
 when StartingIv >= 0.2 and StartingIv < 0.3 then '0.2-0.3'
 when StartingIv >= 0.3 and StartingIv < 0.4 then '0.3-0.4'
 when StartingIv >= 0.4 and StartingIv < 0.5 then '0.4-0.5'
 when StartingIv >= 0.5 and StartingIv < 0.6 then '0.5-0.6'
 when StartingIv >= 0.6 and StartingIv < 0.7 then '0.6-0.7'
 when StartingIv >= 0.7 and StartingIv < 0.8 then '0.7-0.8'
 when StartingIv >= 0.8 and StartingIv < 0.9 then '0.8-0.9'
 when StartingIv >= 0.9 and StartingIv < 1 then '0.9-1'
 when StartingIv >= 1 and StartingIv < 1.1 then '1-1.1'
 else 'ELSE'
 end as IvRange
 , Profit
 from  Trades) a

 group by IvRange
"Batchelor", Developer and EE Topic Advisor
Top Expert 2015
Commented:
Not exactly. Any column not contained in a group by needs to have an aggregate function applied to (min, max, sum, count, avg and the like). The second suggestion has to be:
select 
a.IvRange, sum(Profit) as Profit
FROM
(
select
 case  when StartingIv >= 0 and StartingIv < 0.1 then '0-0.1' 
 when StartingIv >= 0.1 and StartingIv < 0.2 then '0.1-0.2'
 when StartingIv >= 0.2 and StartingIv < 0.3 then '0.2-0.3'
 when StartingIv >= 0.3 and StartingIv < 0.4 then '0.3-0.4'
 when StartingIv >= 0.4 and StartingIv < 0.5 then '0.4-0.5'
 when StartingIv >= 0.5 and StartingIv < 0.6 then '0.5-0.6'
 when StartingIv >= 0.6 and StartingIv < 0.7 then '0.6-0.7'
 when StartingIv >= 0.7 and StartingIv < 0.8 then '0.7-0.8'
 when StartingIv >= 0.8 and StartingIv < 0.9 then '0.8-0.9'
 when StartingIv >= 0.9 and StartingIv < 1 then '0.9-1'
 when StartingIv >= 1 and StartingIv < 1.1 then '1-1.1'
 else 'ELSE'
 end as IvRange
 , Profit
 from  Trades) a
 group by IvRange

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Commented:
good one:  Qlemo :)

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