How can I create a view with self referencing table and a cyclic condition?
0
votes
1
answer
667
views
I have a self-referencing table.
ID BIGINT NOT NULL PRIMAY KEY,
DELETED TIMESTAMP NULL,
PARENT_ID FK
How can I create a view of this table which each row's
DELETED
is NULL
and any of its parent's DELETED
is also NULL
?
So far, I tried and it doesn't work as expected.
CREATE VIEW OPERATOR_
AS
SELECT c.* from OPERATOR AS c LEFT OUTER JOIN OPERATOR AS p ON c.PARENT_ID = p.ID
WHERE c.DELETED_ IS NULL AND p.DELETED_ IS NULL;
## example 1
ID DELETED PARENT_ID
0 2017... NULL NOT SELECTED
1 NULL 0 NOT SELECTED
2 NULL 1 NOT SELECTED
## example 2
ID DELETED PARENT_ID
0 NULL NULL SELECTED
1 2017... 0 NOT SELECTED
2 NULL 1 NOT SELECTED
## example 3
ID DELETED PARENT_ID
0 NULL NULL SELECTED
1 NULL 0 SELECTED
2 2017... 1 NOT SELECTED
Asked by Jin Kwon
(165 rep)
Jul 13, 2016, 05:05 AM
Last activity: Jul 31, 2025, 06:04 AM
Last activity: Jul 31, 2025, 06:04 AM