求助!!
要查询class表中s_stu值大于50,或小于20的记录,只返回s_name和s_stu字段,就应该如何写SQL语句?select s_name,s_stu from class where s_stu>50 or s_stu<20
这为什么不对呀?哪里问题,应该怎么写呀?求帮忙!!
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