Tell me Marek Siudym's age.
select age from editor where name = "Marek Siudym"
Show me his journals.
select 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 where t2.name = "Marek Siudym"
Okay, now I want to know the id, name of each editor and the number of journal committees they are on.
select t1.editor_id, t1.name, count(*) from editor as t1 join journal_committee as t2 on t1.editor_id = t2.editor_id group by t1.editor_id