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create table t (id int, parent_id int); insert into t values (1, 0), (2, 0), (3, 1), (4, 0), (5, 0), (6, 0), (7, 5);
CREATE TABLE
INSERT 0 7
select t.* from t order by coalesce(nullif(parent_id, 0), id), id
id
parent_id
1
0
3
1
2
0
4
0
5
0
7
5
6
0
SELECT 7