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create table t as select 1 as id, 1 as code, 1 as code_parent union all select 2 as id, 2 as code, 2 as code_parent union all select 3 as id, 3 as code, 1 as code_parent union all select 4 as id, 4 as code, 3 as code_parent union all select 5 as id, 5 as code, 2 as code_parent union all select 6 as id, 6 as code, 4 as code_parent union all select 7 as id, 7 as code, 6 as code_parent
SELECT 7
with recursive cte as ( select code_parent, 1 as lev from t where code = 7 union all select t.code_parent, lev + 1 from cte join t on cte.code_parent = t.code where lev < 10 and t.code <> t.code_parent ) select code_parent as code from cte
code
6
4
3
1
SELECT 4