最后一段代码更正为如下比较合适： SELECT s.id sid, s.class_id scid, s.name, s.gender, s.score, c.id cid, c.name cname FROM students s, classes c WHERE s.gender = 'M' AND c.id = s.class_id;
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长宁特产
最后一段代码更正为如下比较合适： SELECT s.id sid, s.class_id scid, s.name, s.gender, s.score, c.id cid, c.name cname FROM students s, classes c WHERE s.gender = 'M' AND c.id = s.class_id;