CREATE TABLE table_66525 ("New area code" FLOAT, "Where" CLOB, "Affected area codes" CLOB, "Format" CLOB, "Effective date" CLOB)

Which Effective date has a Where of illinois, and Affected area codes of 217?
SELECT "Effective date" FROM table_66525 WHERE "Where" = 'illinois' AND "Affected area codes" = '217'
SELECT "Effective date" FROM "table_66525" WHERE "Affected area codes" = '217' AND "Where" = 'illinois'