SELECT *
FROM "nodes.src"
JOIN "names.src" USING (tax_id)
WHERE "name class" = 'scientific name'
;

ALTER TABLE :table ALTER COLUMN tax_id TYPE integer
USING tax_id::integer;
ALTER TABLE :table ALTER COLUMN "parent tax_id" TYPE integer
USING "parent tax_id"::integer;

ALTER TABLE :table ADD PRIMARY KEY (tax_id);

CREATE INDEX ON :table ("parent tax_id");

ALTER TABLE :table ADD FOREIGN KEY ("parent tax_id") REFERENCES :table (tax_id)
    ON UPDATE CASCADE ON DELETE CASCADE;

-- Make name_txt (mostly) globally unique by removing other kingdoms
-- Note that the delete will cascade to descendants
DELETE FROM :table WHERE tax_id IN (
      10239 -- superkingdom Viruses
    , 12884 -- superkingdom Viroids
    , 12908 -- unclassified sequences
    , 28384 -- other sequences
    ,     2 -- superkingdom Bacteria
    ,  2157 -- superkingdom Archaea
    ,  4751 -- kingdom Fungi
    , 33208 -- kingdom Animalia/Metazoa
);

-- Make name_txt completely globally unique by removing duplicates
DELETE FROM :table
WHERE name_txt IN (
    SELECT name_txt
    FROM :table
    GROUP BY name_txt
    HAVING count(*) > 1
)
;
