SQL语句错误: SELECT COUNT(*)as rows FROM (select A.* from news as A )A where mever='cn' and class_id=1

错误信息: Unknown column 'class_id' in 'where clause'SQL语句错误: SELECT * FROM (select A.* from news as A )A where mever='cn' and class_id=1 order by top desc,postdate desc,id desc LIMIT 0, 10

错误信息: Unknown column 'class_id' in 'where clause' 那天资讯,123

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