Tell me the number of journals of editor Szymon Wydra?
select count(*) from journal_committee as t1 join editor as t2 on t1.editor_id = t2.editor_id join journal as t3 on t1.journal_id = t3.journal_id where t2.name = "Szymon Wydra"
Tell me about the sales of journals of editor Szymon Wydra.
select t3.sales from journal_committee as t1 join editor as t2 on t1.editor_id = t2.editor_id join journal as t3 on t1.journal_id = t3.journal_id where t2.name = "Szymon Wydra"
What are the names of editors and the theme of journals for which they serve on committees?
select t2.name, t3.theme from journal_committee as t1 join editor as t2 on t1.editor_id = t2.editor_id join journal as t3 on t1.journal_id = t3.journal_id