圆周长怎么计算

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select * from tbl_Articles WHERE ArticleID=3462144 LIMIT 0,1
select * from tbl_Articles_data WHERE ArticleID=3462144 LIMIT 0,1
select * from tbl_Articles_sphinx where id=3462144 LIMIT 0,1
SELECT ArticleID,Title FROM tbl_Articles WHERE ArticleID IN(540246,542959,473333,456557,850106,516405,383470,447215,453121,504559,482485,504021,512646,520673,494203,384783,456194,100532,402239,392557,374387,460218,450001,363525,1470691,412588,514557,1115384,410784,543812) ORDER BY field (ArticleID,540246,542959,473333,456557,850106,516405,383470,447215,453121,504559,482485,504021,512646,520673,494203,384783,456194,100532,402239,392557,374387,460218,450001,363525,1470691,412588,514557,1115384,410784,543812)