SQL左连接只有一行

Question

使用此SQL查询：

SELECT pictures.IMAGELINK,userdata.BIRTHDATE,userdata.POSITION,InfiniteLove.USERNAME FROM 
InfiniteLove
LEFT JOIN pictures ON InfiniteLove.USERNAME = pictures.USERNAME
LEFT JOIN userdata ON InfiniteLove.USERNAME = userdata.USERNAME
WHERE NOT InfiniteLove.USERNAME = '".$USERNAME."' AND InfiniteLove.GENDER = 
'M' AND InfiniteLove.SEARCH = 'M' OR InfiniteLove.SEARCH = 'B'

我得到了这个结果：

问题是，我只想要每个用户一行。 但是当用户有多张图片时，它会显示多行。

我能做什么，每个用户只能获得一行？

由于

Answer 1

添加GROUP BY子句

SELECT pictures.IMAGELINK,userdata.BIRTHDATE,userdata.POSITION,InfiniteLove.USERNAME FROM 
InfiniteLove
LEFT JOIN pictures ON InfiniteLove.USERNAME = pictures.USERNAME
LEFT JOIN userdata ON InfiniteLove.USERNAME = userdata.USERNAME
WHERE NOT InfiniteLove.USERNAME = '".$USERNAME."' AND InfiniteLove.GENDER = 
'M' AND InfiniteLove.SEARCH = 'M' OR InfiniteLove.SEARCH = 'B'
GROUP BY InfiniteLove.USERNAME