CREATE TABLE table_name_95 (season VARCHAR(255), team VARCHAR(255), number VARCHAR(255), league VARCHAR(255))
What season has a number less than 90, Mitte as the league and spvgg ruhmannsfelden as the team?
    
SQL: SELECT season FROM table_name_95 WHERE number < 90 AND league = "mitte" AND team = "spvgg ruhmannsfelden"