SQLの条件式の書き方について

Question

create table user(
id int,
rental_day varchar(10),
return_day varchar(10)
);

INSERT INTO user
    (id, rental_day,return_day) 
VALUES 
    (1,"2010/10/10"," 2020/10/12"),
    (1,"2010/10/13",null),
    (2,"2010/10/10"," 2020/10/12"),
    (3,null,null)
;

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Answer 1

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