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@@ -187,3 +187,20 @@ insert into books_with_isbn (name, isbn) values (
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set name = excluded.name;
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table books_with_isbn;
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+
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+
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+table species;
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+table genus;
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+
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+select species_name as вид, genus_name as род
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+from species
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+left join genus using(genus_id)
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+order by species_name;
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+
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+select species_name as вид, genus_name as род
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+from species
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+full join genus using(genus_id)
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+order by species_name;
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+
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+
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+
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