Translate the following question to SQL: Find the names of all reviewers who have ratings with a NULL value for the date.

Schema: CREATE TABLE Movie (
    mID INT   PRIMARY KEY,
    title TEXT,
    year INT,
    director TEXT,
    UNIQUE (mID)
);

CREATE TABLE Reviewer (
    rID INT   PRIMARY KEY,
    name TEXT,
    UNIQUE (rID)
);

CREATE TABLE Rating (
    rID INT,
    mID INT,
    stars INT,
    ratingDate date,
    FOREIGN KEY (rID) REFERENCES Reviewer(rID),
    FOREIGN KEY (mID) REFERENCES Movie(mID)
);
user
SELECT DISTINCT name FROM Reviewer AS T1 JOIN Rating AS T2 ON T1.rID  =  T2.rID WHERE ratingDate  =  "null"
assistant