Re: postgresql query

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 ?

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Which version of Postgresql are you using?
However, you may use string_agg like below if its available in your version:

\d t1
Table "public.t1"
Column | Type | Modifiers
--------+---------+-----------
i | integer |
amt | integer |

select * from t1;
i | amt
---+-----
1 | 20
1 | 30
2 | 30
(3 rows)

select i, string_agg(amt::text,',') as c from t1 group by i;;
i | c
---+-------
1 | 20,30
2 | 30
(2 rows)

Have a good day.

On Wed, Jun 19, 2013 at 6:51 AM, Jashaswee <sweet(dot)rinky72(at)gmail(dot)com> 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 ?
>
>
>
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> View this message in context:
> http://postgresql.1045698.n5.nabble.com/postgresql-query-tp5759846.html
> Sent from the PostgreSQL - general mailing list archive at Nabble.com.
>
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2013/6/19 Jashaswee <sweet(dot)rinky72(at)gmail(dot)com>

> 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 do we decide wether 2000 or -1000 refers to the “In quantity”?
Can you show a complete table's structure, please?

--
Victor Y. Yegorov

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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i am using postgresql 8.4 version..but this doesn't support the function

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i have tried in that way but its showing that the debit column doesn't exist

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Jashaswee wrote
> i have tried in that way but its showing that the debit column doesn't
> exist

So show us what exactly it is that you tried and maybe someone can tell you
what is wrong.

David J.

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