Translate the following question to SQL: Count the number of different teams involved in match season.

Schema: CREATE TABLE country (
    Country_id INT   PRIMARY KEY,
    Country_name TEXT,
    Capital TEXT,
    Official_native_language TEXT,
    UNIQUE (Country_id)
);

CREATE TABLE team (
    Team_id INT   PRIMARY KEY,
    Name TEXT,
    UNIQUE (Team_id)
);

CREATE TABLE match_season (
    Season REAL   PRIMARY KEY,
    Player TEXT,
    Position TEXT,
    Country INT,
    Team INT,
    Draft_Pick_Number INT,
    Draft_Class TEXT,
    College TEXT,
    UNIQUE (Season),
    FOREIGN KEY (Team) REFERENCES team(Team_id),
    FOREIGN KEY (Country) REFERENCES country(Country_id)
);

CREATE TABLE player (
    Player_ID INT   PRIMARY KEY,
    Player TEXT,
    Years_Played TEXT,
    Total_WL TEXT,
    Singles_WL TEXT,
    Doubles_WL TEXT,
    Team INT,
    UNIQUE (Player_ID),
    FOREIGN KEY (Team) REFERENCES team(Team_id)
);
user
SELECT count(DISTINCT Team) FROM match_season
assistant