[英]My sub-query returns more than 1 row
Of course, the problem is that I'm getting more rows in the sub-query. 当然,问题在于我在子查询中获得了更多的行。
But I don't know how to fix it in order to achieve my goals. 但是我不知道如何解决它以实现我的目标。
This is how my query looks like: 这是我的查询的样子:
SELECT movies.name, movies.id,
(SELECT username FROM users INNER JOIN movies ON
movies.added_by_id = users.id)
AS added_by_username FROM movies
For example we have more movies in our db, and those movies were added by users. 例如,我们的数据库中有更多电影,而这些电影是由用户添加的。
GOALS: I want to display all the movies and the usernames of the users who added them. 目标:我想显示所有电影以及添加电影的用户名。
No need for a subquery: 无需子查询:
SELECT movies.name, movies.id, username
FROM users
INNER JOIN movies
ON movies.added_by_id = users.id
SELECT movies.name, movies.id,
(SELECT TOP 1 username FROM users INNER JOIN movies ON
movies.added_by_id = users.id)
AS added_by_username FROM movies
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