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Do computation in select statement using a current row column

Posted on 2009-04-01
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Last Modified: 2012-05-06
I am writing SQL and need to write a query which returns, not only columns, but a computation on a column using the value of another column in the row.

so far I have:
query1 -> "select a, b, c, d from table1 where f = 1"

I want to do add another column to query1 (say ..e) which is the result of a select on another table where I use column 'a' from query1.

How can I accomplish this?
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Question by:ipaman
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8 Comments
 
LVL 23

Expert Comment

by:apresto
Comment Utility
SELECT a, b, c, d, e FROM Table1 T1 INNER JOIN Table2 T2 ON T1.A = T2.ID
What is the name of the column which acts as your relationship in table2.
Infact why dont you paste your table structures here and we can go through writting you a join
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LVL 73

Expert Comment

by:sdstuber
Comment Utility
you can embed the 2nd query within the select and reference the columns from the outer query like this...


select a, b, c, d, (select table2.e+ table1.a from table2 where table2.id = table1.c)
from table1 where f = 1
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Author Comment

by:ipaman
Comment Utility
Below is my current query:
select id,agent_number 'Agent #',coverage_area 'Coverage Area', [Type] = CASE agent_type
WHEN 'S' THEN 'Skip'
WHEN 'R' THEN 'Recovery'
WHEN 'M' THEN 'Remarketing'
END
,city 'City',
[state] 'State',terms 'Terms', recovery_fee 'Recovery',closed_fee 'Closed',imp_client_fee 'Impound',
recovery_vol_fee 'Voluntary', imp_days_nocharge_fee 'Free Days', rating 'Rating'
from Agent
where agent_status = 1
and agent_number is not null
order by state

This is the query I need to do to create the 'New column' called '#Cases' in the query above:
(select count(distinct case_number) from [case] c, history h,
where c.id=h.case_id and
c.agent_id='current value of column 'a' above'
and  h.status=4) '# Cases'

so the relationship is agent_id in the case table to the id in the agent table...but I am only doing a count.
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LVL 73

Expert Comment

by:sdstuber
Comment Utility
try this...  (assuming "a" is agent.id)
select id,agent_number 'Agent #',coverage_area 'Coverage Area', [Type] = CASE agent_type

WHEN 'S' THEN 'Skip'

WHEN 'R' THEN 'Recovery'

WHEN 'M' THEN 'Remarketing'

END

,city 'City',

[state] 'State',terms 'Terms', recovery_fee 'Recovery',closed_fee 'Closed',imp_client_fee 'Impound',

recovery_vol_fee 'Voluntary', imp_days_nocharge_fee 'Free Days', rating 'Rating',

(select count(distinct case_number) from [case] c, history h, 

where c.id=h.case_id and 

c.agent_id=Agent.id

and  h.status=4) '# Cases'

from Agent 

where agent_status = 1 

and agent_number is not null 

order by state

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Author Comment

by:ipaman
Comment Utility
the "select count(distinct case_number..." fails because it doesn't know what 'Agent' is.
If I add the agent table to the select and do a join it willl give me the intersection of the tables.
I only want to do the calculation on the other table where the current value of 'id' is used in the subquery.

not sure if i am making sense on this...
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LVL 73

Expert Comment

by:sdstuber
Comment Utility
maybe your database doesn't support subqueries of that form.
You didn't specify what db you were using, I assumed Oracle, but based on your syntax, it must be something else.   If the subquery syntax isn't supported in your db then you'll need to do a join  as suggested above
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Author Comment

by:ipaman
Comment Utility
sorry. this is sql server.
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Accepted Solution

by:
ipaman earned 0 total points
Comment Utility
I believe I found the best solution to this based upon a previous post I had:

with assigned_cases as
(select agent_id, count(*) Assigned from [case] where ([status] & 4) > 0  group by agent_id),

tass_cases as
(select agent_id, count(distinct case_number) TAss from [case] c,history h
 where c.id=h.case_id and h.status=4
 group by agent_id),

trec_cases as
(select c.agent_id, count(distinct case_number) TRec from [case] c, history h
 where c.id=h.case_id and h.status=32
 group by c.agent_id)

select id,agent_number 'Agent #',[name],coverage_area 'Coverage Area', [Type] = CASE agent_type
WHEN 'S' THEN 'Skip'
WHEN 'R' THEN 'Recovery'
WHEN 'M' THEN 'Remarketing'
END
,city 'City',
[state] 'State',terms 'Terms', recovery_fee 'Recovery',closed_fee 'Closed',imp_client_fee 'Impound',
recovery_vol_fee 'Voluntary', imp_days_nocharge_fee 'Free Days', rating 'Rating',
assigned_cases.Assigned 'Number Assigned',
'Cap.' = CASE WHEN ISNUMERIC(number_trucks) = 1
        THEN convert(int, number_trucks) * 15
      ELSE ''
      END,
tass_cases.TAss '# Cases',
'Rec.%' = CASE WHEN ((trec_cases.TRec/(tass_cases.TAss * .8)) * 100)> 100
          THEN 100
          ELSE (trec_cases.TRec/(tass_cases.TAss * .8)) * 100
          END
from Agent a
left outer join assigned_cases on a.id=assigned_cases.agent_id
left outer join tass_cases on a.id=tass_cases.agent_id
left outer join trec_cases on a.id=trec_cases.agent_id
where a.agent_status = 1
and a.agent_number is not null
order by state
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