SELECT
    s.bk7code plevel
    ,bk7des1 
    ,bk7des2
    ,count(DISTINCT trim(CASE WHEN dba = '' THEN descr ELSE dba END)) FILTER (WHERE code IS NOT NULL) cnt
    ,string_agg(DISTINCT i.JBPLCD ,', ') listcodes
    ,jsonb_agg(DISTINCT trim(CASE WHEN dba = '' THEN descr ELSE dba END)) custs
FROM
    lgdat.sach s
    LEFT OUTER JOIN rlarp.cust c ON
        s.BK7CODE = c.plevel
        AND c.status = 'A'
    LEFT OUTER JOIN "CMS.CUSLG".IPRCBHC i ON
        i.JBPLVL = c.PLEVEL 
WHERE
    s.bk7code <> ''
GROUP BY 
    s.bk7code
    ,bk7des1 
    ,bk7des2
HAVING
    count(DISTINCT trim(CASE WHEN dba = '' THEN descr ELSE dba END)) FILTER (WHERE code IS NOT NULL) >= 0
ORDER BY 
    cnt DESC
    , plevel ASC