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Asked: 2026-05-15T12:34:53+00:00

I have a table called _sample_table_delme_data_files which contains some duplicates. I want to copy

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I have a table called _sample_table_delme_data_files which contains some duplicates. I want to copy its records, without duplicates, into data_files:

INSERT INTO data_files (SELECT distinct * FROM _sample_table_delme_data_files);
ERROR:  could not identify an ordering operator for type box3d
HINT:  Use an explicit ordering operator or modify the query.

Problem is, PostgreSQL can not compare (or order) box3d types. How do I supply such an ordering operator so I can get only the distinct into my destination table?

Thanks in advance,

Adam

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1 Answer

  1. Editorial Team

    If you don’t add the operator, you could try translating the box3d data to text using its output function, something like:

    INSERT INTO data_files (SELECT distinct othercols,box3dout(box3dcol) FROM _sample_table_delme_data_files);

    Edit The next step is: cast it back to box3d:

    INSERT INTO data_files SELECT othercols, box3din(b) FROM (SELECT distinct othercols,box3dout(box3dcol) AS b FROM _sample_table_delme_data_files);

    (I don’t have box3d on my system so it’s untested.)

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