Re: postgresql query - Mailing list pgsql-general

From David Johnston
Subject Re: postgresql query
Date
Msg-id 1371685570732-5760003.post@n5.nabble.com
Whole thread Raw
In response to postgresql query  (Jashaswee <sweet.rinky72@gmail.com>)
Responses Re: postgresql query  (Jashaswee <sweet.rinky72@gmail.com>)
List pgsql-general
Jashaswee wrote
> I have numeric values in a numeric column.the column has two parts.i want
> to split in 2 differnet column .
> The column value looks like this:
>
> Quantity
> 2000
> -1000
>
> both the quantity values are  of a same product.but i want these in a
> single line.
> so what i want is a result set that looks like:
> In quantity  Out quantity
> -----------  ------------
> 2000          -1000
>
> how can i get this in a select statement  ?

I presume this is a debit/credit situation.

Basically you use a CASE expression to put the amount into the correct
column depending on whether it is greater or less than zero.  The rest of
the query is simply a matter of what kind of detail you want.

WITH make_debit_credit_columns_for_each_record AS (
SELECT ...
, CASE WHEN amt >= 0 THEN amt ELSE 0.00 END AS debit
, CASE WHEN amt < 0 THEN amt ELSE 0.00 END AS credit
FROM source_table
)
SELECT ..., SUM(debit) AS total_debit, SUM(credit) AS total_credit
FROM make_debit_credit_columns_for_each_record
GROUP BY ...

David J.




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