Question

我有下面的查询，并希望删除子查询，因为它会减慢查询速度。我尝试过LEFT JOIN，但它返回零结果。如何删除子查询？

SELECT DISTINCT releases.* 
FROM releases
INNER JOIN artist_love ON  releases.all_artists LIKE CONCAT('%',artist_love.artist,'%')
                           AND artist_love.user =  'Quickinho'
INNER JOIN label_love ON label_love.label = releases.label_no_country
                         AND label_love.user =  'Quickinho'
                         AND releases.id NOT IN 
                                        (
                                            SELECT release_id
                                            FROM charts_extended
                                            WHERE artist =  'Quickinho'
                                        )    
ORDER BY releases.date DESC 
LIMIT 0 , 102

Answer 1

SELECT DISTINCT releases.* 
FROM releases
INNER JOIN artist_love ON  releases.all_artists LIKE CONCAT('%',artist_love.artist,'%')
AND artist_love.user =  'Quickinho'
INNER JOIN label_love ON label_love.label = releases.label_no_country
AND label_love.user =  'Quickinho'
left join charts_extended on charts_extended.release_id=label_love=releases.id and charts_extended.artist =  'Quickinho'
where charts_extended.release_id is null
ORDER BY releases.date DESC 
LIMIT 0 , 102

如何在连接中使用NOT？

1 个答案: