What's the equivalent for LISTAGG (Oracle database) in PostgreSQL?

The equivalent function in PostgreSQL is STRING_AGG()

SELECT STRING_AGG (column_name,', ') 
FROM my_table

string_agg : input values concatenated into a string, separated by delimiter

For example, get list of all agreement_id then represent it in a string, in Apache Ofbiz 17.12.04

SELECT STRING_AGG(agreement_id, ', ') FROM agreement_item;

-- result
-- "8000, DS-1000-SALES, DS-1000-PURCH, 9000, AGR_SALES"

From Postgres 9.0 or later, I believe you could do something like this:

SELECT c_id, STRING_AGG(c_grp_id, ',' ORDER BY c_grp_id) AS group_ids 
FROM c_grp_at 
GROUP BY c_id

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