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create table penguins_by_islands ( island text unique not null, penguins_count int ); insert into penguins_by_islands select island, count(*) from penguins group by island; ; CREATE TRIGGER total_trigger AFTER DELETE ON penguins BEGIN UPDATE penguins_by_islands SET penguins_count = penguins_count - 1 WHERE island = OLD.island AND penguins_count > 1; DELETE FROM penguins_by_islands WHERE island = OLD.island AND penguins_count = 1; END; ; delete from penguins where island = 'Biscoe'; select * from penguins_by_islands order by penguins_count;

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