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.klaver@aklaver.com