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 Sum of a subquery
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centriccd
Starting Member

1 Posts

Posted - 12/11/2012 :  17:04:31  Show Profile  Reply with Quote
I have a DB that has been in use for 8 years. We are changing the data in a couple of fields and I need to update my reporting queries to ensure that they are backwards compatible with the old data.

There are 3 fields in 2 tables:

gen.loan_amt
gen.equity_draw (will be depreciated)
custom_data.value

We are shifting our data as follows:

gen.loan_amt >>> custom_data.value
gen.equity_draw >>> gen.loan_amt

My queries work great for selecting individual rows, but I need to also be able to aggregate these upwards and pull sums.

This is what I have for pulling rows of data:

SELECT COUNT(gen.file_id) AS units,
SUM(CASE WHEN (SELECT custom_data.value
FROM custom_data
WHERE custom_data.field = 'und_08' AND custom_data.file_id = gen.file_id) IS NULL
THEN gen.loan_amt
ELSE
(SELECT custom_data.value
FROM custom_data
WHERE custom_data.field = 'und_08' AND custom_data.file_id = gen.file_id) END) AS maxClaim
FROM gen

What I need is for this query to result is a recordCount (units) and total (maxClaim). Can this be done?

sodeep
Flowing Fount of Yak Knowledge

USA
7174 Posts

Posted - 12/11/2012 :  20:01:36  Show Profile  Reply with Quote
Do you mean this

SELECT COUNT(gen.file_id) AS units, 
SUM(Case When c.field = 'und_08' then c.Value Else gen.loan_amt End) as TotalMaxClaim
FROM custom_data c
left join gen gen on gen.file_id = c.file_id
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