电子表格中平均数怎样计算

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select * from tbl_Articles WHERE ArticleID=2609313 LIMIT 0,1
select * from tbl_Articles_data WHERE ArticleID=2609313 LIMIT 0,1
select * from tbl_Articles_sphinx where id=2609313 LIMIT 0,1
SELECT ArticleID,Title FROM tbl_Articles WHERE ArticleID IN(1129013,2223607,1284951,349676,1604705,824382,1802447,1671939,1062928,716403,522125,2754055,714004,2924512,1436893,842596,201077,850834,1775458,1373142,1133147,517859,510222,2409826,1511490,2686628,2201296,3006927,2829885,1046512) ORDER BY field (ArticleID,1129013,2223607,1284951,349676,1604705,824382,1802447,1671939,1062928,716403,522125,2754055,714004,2924512,1436893,842596,201077,850834,1775458,1373142,1133147,517859,510222,2409826,1511490,2686628,2201296,3006927,2829885,1046512)