[英]SQL Left Join Only One Row
通过使用此 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 = '".$USERNAME."' AND InfiniteLove.GENDER =
'M' AND InfiniteLove.SEARCH = 'M' OR InfiniteLove.SEARCH = 'B'
我得到这个结果:
问题是,我只想要每个用户的一行。 但是当用户有不止一张图片时,它会显示多行。
我能做什么,我只能从每个用户那里得到一行?
谢谢
添加GROUP BY
子句
SELECT pictures.IMAGELINK,userdata.BIRTHDATE,userdata.POSITION,InfiniteLove.USERNAME FROM
InfiniteLove
LEFT JOIN pictures ON InfiniteLove.USERNAME = pictures.USERNAME
LEFT JOIN userdata ON InfiniteLove.USERNAME = userdata.USERNAME
WHERE NOT InfiniteLove.USERNAME = '".$USERNAME."' AND InfiniteLove.GENDER =
'M' AND InfiniteLove.SEARCH = 'M' OR InfiniteLove.SEARCH = 'B'
GROUP BY InfiniteLove.USERNAME
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