Обсуждение: merge multiple records into 1

What would be the best way to "flatten" a set of records into one column with a query? 

example:

You have a table called tbletters

id letters
1      a
2      b
3      c
4      d

So I can return this as one column in one record

a,b,c,d 

 

 

 

On Sat, Aug 23, 2003 at 20:16:51 -0400,
  Brian Maguire <bmaguire@vantage.com> wrote:
> What would be the best way to "flatten" a set of records into one column with a query?
>
> example:
>
> You have a table called tbletters
>
> id letters
> 1      a
> 2      b
> 3      c
> 4      d
>
> So I can return this as one column in one record
>
> a,b,c,d

You could write an aggregate function that concatenates strings. There should
even be examples of some code that does this in the archives from within
the last 6 months.

Hi,

how about tablefunc_crosstab from contrib/tablefunc ?

Brian Maguire wrote, On 8/24/2003 2:16 AM:
> What would be the best way to "flatten" a set of records into one column with a query?
>
> example:
>
> You have a table called tbletters
>
> id letters
> 1      a
> 2      b
> 3      c
> 4      d
>
> So I can return this as one column in one record
>
> a,b,c,d
C.