我有一个select语句多加入如下:MySQL的语句返回同一行两次
SELECT *
FROM supplements
LEFT JOIN tutorials
ON supplements.id = tutorials.supplement_id
LEFT JOIN brands
ON supplements.brand_id = brands.id
WHERE supplements.id = '75'
当我运行它,它与ID 75返回连续两次!
这是怎么发生的?
? – m4t1t0 2013-03-08 08:15:56