löschen/wählen Hierarchiedaten in postgresql

Question

Ich habe Tabelle comment, und ich möchte durch die Eingabe löschen id und auch alle Kind löschen,

unter zwei Abfrage beide nicht alle Hierarchiedaten löschen, löschen nur sich selbst und ein Kind Reihe ...

Gibt es etwas falsch, wenn rekursive in with Schließung auswählen?

Kommentar

id | parent_comment_id 
1 | 
2 | 1 
3 | 2 
4 | 

Abfrage 1

WITH RECURSIVE coH AS (
    SELECT co.id, 
    co.id AS rootId 
    FROM comment co 

    UNION ALL 

    SELECT coChild.id, 
    coChild.parent_comment_id as parentCommentId 
    FROM comment coChild 
    JOIN coH coP ON coP.id = coChild.parent_comment_id 
) 
DELETE FROM comment WHERE id IN (
    SELECT id FROM coH WHERE rootId = $1 
) 

Abfrage 2

DELETE FROM comment WHERE id IN (
    WITH RECURSIVE coH AS (
    SELECT co.id, 
     co.id AS rootId 
     FROM comment co 

    UNION ALL 

    SELECT coChild.id, 
     coChild.parent_comment_id as parentCommentId 
     FROM comment coChild 
     JOIN coH coP ON coP.id = coChild.parent_comment_id 
) 

    SELECT id FROM coH WHERE rootId = $1 
) 

UPDATE

var dbQuery = `DELETE FROM comment WHERE id IN (
    WITH RECURSIVE coH (id, parentCommentId, rootId) AS (
    SELECT co.id, 
     co.parent_comment_id as parentCommentId, 
     co.id AS rootId 
     FROM comment co 

    UNION ALL 

    SELECT coChild.id, 
     coChild.parent_comment_id as parentCommentId, 
     coP.rootId 
     FROM comment coChild 
     JOIN coH coP ON coP.id = coChild.parent_comment_id 
) 

    SELECT id FROM coH WHERE rootId = $1 
)`; 

Answer 1

es einfach halten, setzen Sie den Parameter in der ersten Abfrage von rekursiven mit:

with recursive cbase as (
    select 1 as id -- select $1 as id 

    union all 

    select child.id 
    from comment as child 
    join cbase on cbase.id = child.parent_comment_id 
) 
delete from comment 
where id in (select * from cbase) 
returning id; 

id 
---- 
    1 
    2 
    3 
(3 rows) 

DELETE 3