Re: tab_to_sting

On 07/24/2014 08:03 AM, Ramesh T wrote:
> I have try
> select string_agg(partname,':') from part_tab; its return same,
>
> ERROR: function string_agg(bigint, unknown) does not exist
> LINE 1: select string_agg(part_id,':') from part;

Try:

select string_agg(part_id::text,':') from part;

> ^
> HINT: No function matches the given name and argument types. You might
> need to add explicit type casts.
>
> i thought string_agg and array_agg same, is it right..?

No:

http://www.postgresql.org/docs/9.3/static/functions-aggregate.html

array_agg(expression) any array of the argument type input values,
including nulls, concatenated into an array

string_agg(expression, delimiter) (text, text) or (bytea, bytea) same
as argument types input values concatenated into a string, separated by
delimiter

>
>
>

--
Adrian Klaver
adrian(dot)klaver(at)aklaver(dot)com