WPs为什么计算不了平均值

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select * from tbl_Articles WHERE ArticleID=1791951 LIMIT 0,1
select * from tbl_Articles_data WHERE ArticleID=1791951 LIMIT 0,1
select * from tbl_Articles_sphinx where id=1791951 LIMIT 0,1
SELECT ArticleID,Title FROM tbl_Articles WHERE ArticleID IN(3380281,1154477,3133659,1116368,3490855,1868817,1922971,1174571,1125855,3469312,3474867,3107893,381108,553343,3239595,3433328,3343957,878272,3459013,638432,723661,2538025,1138686,3150260,551478,3484454,3291295,1616804,3020768,593126) ORDER BY field (ArticleID,3380281,1154477,3133659,1116368,3490855,1868817,1922971,1174571,1125855,3469312,3474867,3107893,381108,553343,3239595,3433328,3343957,878272,3459013,638432,723661,2538025,1138686,3150260,551478,3484454,3291295,1616804,3020768,593126)