Function array_to_string(text[], text) does not exist ???

Hi,

I’m trying to call the array_to_string function like this :

            SELECT array_to_string(array[1, 2, 3], '~^~') à it comes directly from the doc.

I get this error msg :

            ERROR:  parser: parse error at or near "[" at character 24

So I tried this way

            SELECT array_to_string('{1, 2, 3}', '~^~')

I get this error msg :

            ERROR:  Function array_to_string("unknown", "unknown") does not exist

      Unable to identify a function that satisfies the given argument types

      You may need to add explicit typecasts

So I tried to cast it

            SELECT array_to_string(CAST('{1, 2, 3}' AS _int8), CAST('~^~' AS text))

I get this error msg :

            ERROR:  Function array_to_string(bigint[], text) does not exist

      Unable to identify a function that satisfies the given argument types

      You may need to add explicit typecasts

Any help would be greatly appreciated…

Thanks