小编Kum*_*mar的帖子

这些是我的 2 个表id_hierarchy和hierarchy_link：

CREATE TABLE id_hierarchy
(
    id integer NOT NULL,
    hierarchy integer
);
insert into id_hierarchy values (11,2),(22,3),(44,5),(77,8),(170,11),
(190,13),(240,18),(255,20);

CREATE TABLE hierarchy_link
(
    hid integer NOT NULL,
    parent_hid integer
);
insert into hierarchy_link values (1,0),(2,1),(3,2),(5,3),(8,5),(11,8),
(13,11),(15,13),(18,15),(20,18);

与id_hierarchy.hierarchy=hierarchy_link.hid

对于以下 CTE 查询：

with recursive rt1 as(
    select id,hid,parent_hid||'->'||hid as str 
    from rt2 
    where rt2.parent_hid=1
    union
    select t.id,t.hid,s.str||'->'||t.hid as str 
    from rt2 t 
    inner join rt1 s on (s.hid=t.parent_hid)
),
rt2 as (
    select id, …