您执行两次联接：
SELECt u.username, i1.path AS thumb, i2.path AS full FROM users AS u JOIN images AS i1 ON u.thumb_id = i1.image_id JOIN images AS i2 ON u.fullimage_id = i2.image_id
您执行两次联接：
SELECt u.username, i1.path AS thumb, i2.path AS full FROM users AS u JOIN images AS i1 ON u.thumb_id = i1.image_id JOIN images AS i2 ON u.fullimage_id = i2.image_id
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