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[英]How do I select distinct rows where a column may have a number of the same values but all their 2nd columns have the same value?
[英]How to select rows based on a column value I don't have, but that exists in the same row as a column value I do have?
假设我有一个如下表:
movie_author | movie_name | movie_price
如果我有一行的movie_name列值,我将如何进行查询以使用与包含movie_name的行中的movie_author相同的movie_author获取所有电影?
我可以在两个查询中执行此操作:第一个从与我拥有的movie_name相对应的行获取movie_author,然后第二个获取具有相同movie_author的所有行,但是如何在一个查询中执行此操作?
例如,使用IN
:
SELECT * from movies m2
WHERE m2.movie_author in (
SELECT m1.movie_author
FROM movies m1
WHERE m1.movie_name like '%AAA%'
)
您可以使用连接,如下所示:
SELECT m1.*
FROM movies m1 inner join movies m2
on m1.movie_author = m2.movie_author
and m2.movie_name='Movie name'
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