数据库连接出错:select distinct a.*, c.content,a.posttime as full_posttime
from old_article_keywords_mapping m
left join old_article a on a.aid=m.aid
left join old_reply c ON c.aid=a.aid
where m.del_flag=0 and m.keyword_id='57'
ORDER BY a.posttime desc
limit 180,30
0数据库连接出错:SELECT COUNT(*) AS num FROM old_article_keywords_mapping WHERE keyword_id=57
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