how to convert a string array to a string. fct array_to_string seem to work only for INT array??

Hi all,

I'm messing with this, I think simple, problem. I searched the doc
and the web without success .. hum
I have a string array(Compte[]) and I need to create the following
string statement to populate a temporary table

statement := ' INSERT INTO T_CR1 ( CRNUM, CRMONT, CSGLNUM, CRDATE)
SELECT CRNUM, CSGLNUM, CRMONT, CRDATE
FROM CR INNER JOIN CS ON CR.CRNUM = CS.CSCRNUM AND
CR.CRYPNUM = CS.CSYPNUM
WHERE CRYPNUM = ' || quote_literal(companyId) || '
AND CRDATE <= CURRENT_DATE
AND CSGLNUM IN {' || array_to_string(Compte, ',') || '}';

EXECUTE statement;

For now I get :

INSERT INTO T_CR1 ( CRNUM, CRMONT, CSGLNUM, CRDATE)
SELECT CRNUM, CSGLNUM, CRMONT, CRDATE
FROM CR INNER JOIN CS ON CR.CRNUM = CS.CSCRNUM AND
CR.CRYPNUM = CS.CSYPNUM
WHERE CRYPNUM = 'M'
AND CRDATE <= CURRENT_DATE
AND CSGLNUM IN {cpt1, cpt2}

But I want:

INSERT INTO T_CR1 ( CRNUM, CRMONT, CSGLNUM, CRDATE)
SELECT CRNUM, CSGLNUM, CRMONT, CRDATE
FROM CR INNER JOIN CS ON CR.CRNUM = CS.CSCRNUM AND
CR.CRYPNUM = CS.CSYPNUM
WHERE CRYPNUM = 'M'
AND CRDATE <= CURRENT_DATE
AND CSGLNUM IN {'cpt1', 'cpt2'}

How can I do that. I expected to find a standard function in the doc to
do that ...

Thanks for your help!

Best Regards
David