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table:
id parent_id
--------------
a_1 NULL
a_2 NULL
b_1 a_1
c_1 b_1
d_1 c_1
Now, I have id:d_1
How can I get a_1,b_1,c_1 in one SQL query? (d_1‘s ancestor ids)?
I really don’t think you can do this in a simple SQL statement, it’s a fundamental limitation of the SQL language.
Here is a heinous stored procedure that does roughly what you want (for SQL Server). So you would need to do something like this.