how t use start with -connect by nocycle in postgresql - postgresql

Question

SELECT coalesce(RPAD('IN',16,' ') || RPAD( M.CASETYPE||'/' || M.CASENUMBER || '/' || M.CASEYEAR,16, ' '),' ') as inmatter
FROM (
select level as LEV, l1.LINKCASECCIN as CCI ,l1.linkcategorycode as lcode
from hclive.LINKEDMATTERS l1
start with l1.MAINCASECCIN ='001003201400100' and l1.linkcategorycode='I'
connect by nocycle prior l1.LINKCASECCIN = l1.MAINCASECCIN and l1.linkcategorycode = 'I'
) s1,
hclive.MAIN M
where M.CCIN=CCI

Answer 1

connect by is done with a recursive common table expression in Postgres.
with recursive tree as (
select 1 as level, l1.linkcaseccin as cci, l1.linkcategorycode as lcode
from hclive.linkedmatters l1
where l1.maincaseccin ='001003201400100'
and l1.linkcategorycode='I'
union all
select p.level + 1, c1.linkcaseccin as cci, c1.linkcategorycode as lcode
from hclive.linkedmatters c1
join tree p on p.maincaseccin = c1.linkcaseccin
where c1.linkcategorycode='I'
)
select coalesce(rpad('IN',16,' ') || rpad( m.casetype||'/' || m.casenumber || '/' || m.caseyear,16, ' '),' ') as inmatter
from tree t
join hclive.main M on m.ccin = t.cci;
The level column does not seem to be necessary as you don't use it at all in your query, but I left in there as an example to get the same information in Postgres.