什么叫自然数

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select * from tbl_Articles WHERE ArticleID=460200 LIMIT 0,1
select * from tbl_Articles_data WHERE ArticleID=460200 LIMIT 0,1
select * from tbl_Articles_sphinx where id=460200 LIMIT 0,1
SELECT ArticleID,Title FROM tbl_Articles WHERE ArticleID IN(100478,1110408,1106623,100522,87070,2127968,365728,1094112,1115227,3264734,559786,1090599,1671157,1207210,1033857,460200,1761487,1297353,1087747,100394,363275,86164,1089002,2060036,1104171,377665,1105530,660655,639648,852840) ORDER BY field (ArticleID,100478,1110408,1106623,100522,87070,2127968,365728,1094112,1115227,3264734,559786,1090599,1671157,1207210,1033857,460200,1761487,1297353,1087747,100394,363275,86164,1089002,2060036,1104171,377665,1105530,660655,639648,852840)