Translate the following question to SQL: How many storms had death records?

Schema: CREATE TABLE storm (
    Storm_ID INT   PRIMARY KEY,
    Name TEXT,
    Dates_active TEXT,
    Max_speed INT,
    Damage_millions_USD REAL,
    Number_Deaths INT,
    UNIQUE (Storm_ID)
);

CREATE TABLE region (
    Region_id INT   PRIMARY KEY,
    Region_code TEXT,
    Region_name TEXT,
    UNIQUE (Region_id)
);

CREATE TABLE affected_region (
    Region_id INT   PRIMARY KEY,
    Storm_ID INT   PRIMARY KEY,
    Number_city_affected REAL,
    PRIMARY KEY (Region_id, Storm_ID),
    UNIQUE (Region_id, Storm_ID),
    FOREIGN KEY (Storm_ID) REFERENCES storm(Storm_ID),
    FOREIGN KEY (Region_id) REFERENCES region(Region_id)
);
user
SELECT count(*) FROM storm WHERE Number_Deaths  >  0
assistant