-- Database schema
| journal : Journal_ID [ INT ] primary_key , Date [ TEXT ] , Theme [ TEXT ] , Sales [ INT ] | editor : Editor_ID [ INT ] primary_key , Name [ TEXT ] , Age [ INT ] | journal_committee : Editor_ID [ INT ] primary_key journal_committee.Editor_ID = editor.Editor_ID , Journal_ID [ INT ] journal_committee.Journal_ID = journal.Journal_ID , Work_Type [ TEXT ] |
-- -- Show the names of editors that are on at least two journal committees.

SELECT T1.Name FROM editor AS T1 JOIN journal_committee AS T2 ON T1.Editor_ID  =  T2.Editor_ID GROUP BY T1.Name HAVING COUNT(*)  >=  2;