CREATE TABLE table_name_3 (year VARCHAR2, main VARCHAR2, hessen VARCHAR2)

Which year has a Main of Eintracht Frankfurt and Hessen of FSV Mainz 05?
SELECT year FROM table_name_3 WHERE main = "eintracht frankfurt" AND hessen = "fsv mainz 05"
SELECT "year" FROM "table_name_3" WHERE "eintracht frankfurt" = "main" AND "fsv mainz 05" = "hessen"