Ah yes. I also had to remove the reference to 'D'. <pre> sqlite> select docs.id, docs.title AS Title, authors.author AS Author, docs.source AS Source, ...> ( ...> select group_concat(keyword) ...> from keywords ...> where docid = docs.docid ...> and authorid = docs.Authorid ...> ) ...> from docs, authors ...> where docs.authorid = authors.authorid ...> and docs.docid = authors.docid ...> order by docs.id desc ...> limit 5; 49|Redeeming Charles Babbage's Mechanical Computer|Swade,Doron D.|Scientific American 1993-02|Computer Technology,Engineering,Difference Engine 48|A Partly True Story|Stewart,Ian|Scientific American 1993-02|Mathematics,Fuzzy Logic 47|Alphabet's Now Building Cities|Wright,Emily|Wired 2018-01-02|Smart City,Urban Design 46|The Talented Luthier|Gilchrist,Jim|Scotland Magazine 2021-01|Music - Violin,Luthier,Art 45|Sean Connery|Rowe,Jenny;Adolph,Anthony|Scotland Magazine 2021-01|Sean Connery,Biography,Scottish Ancestry </pre>