CREATE TABLE journal_committee (Editor_ID VARCHAR2)
CREATE TABLE editor (Name VARCHAR2, Editor_ID VARCHAR2)

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