Translate the following question to SQL: How many persons are not body builders?

Schema: CREATE TABLE body_builder (
    Body_Builder_ID INT   PRIMARY KEY,
    People_ID INT,
    Snatch REAL,
    Clean_Jerk REAL,
    Total REAL,
    UNIQUE (Body_Builder_ID),
    FOREIGN KEY (People_ID) REFERENCES people(People_ID)
);

CREATE TABLE people (
    People_ID INT   PRIMARY KEY,
    Name TEXT,
    Height REAL,
    Weight REAL,
    Birth_Date TEXT,
    Birth_Place TEXT,
    UNIQUE (People_ID)
);
user
SELECT count(*) FROM people WHERE people_id NOT IN (SELECT People_ID FROM body_builder)
assistant