php - 从两个表连接，然后从结果连接到第三个表mysql

Question

我试图从两个表和结果表中获取JOIN，然后与第三个表进行JOIN，但它抛出错误，让我知道我在这里做错了什么 -

SELECT e.id as e_id, e.name as e_name, e.artist_id as e_artist_id, e.event_date as e_date, 
        v.id as v_id, v.name as v_name, v.address as v_address, v.latitude as v_latitude, v.longitude as v_longitude 
FROM events e 
LEFT JOIN venues v 
ON e.venue_id = v.id WHERE v.id = 12
LEFT JOIN artists a
ON e.artist_id = a.id

Answer 1

您需要将 WHERE 子句更改为 AND -

SELECT e.id as e_id, e.name as e_name, e.artist_id as e_artist_id, e.event_date as e_date, 
        v.id as v_id, v.name as v_name, v.address as v_address, v.latitude as v_latitude, v.longitude as v_longitude 
FROM events e 
LEFT JOIN venues v 
ON e.venue_id = v.id AND v.id = 12
LEFT JOIN artists a
ON e.artist_id = a.id