AIC的价值由什么决定?

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select * from tbl_Articles WHERE ArticleID=949629 LIMIT 0,1
select * from tbl_Articles_data WHERE ArticleID=949629 LIMIT 0,1
select * from tbl_Articles_sphinx where id=949629 LIMIT 0,1
SELECT ArticleID,Title FROM tbl_Articles WHERE ArticleID IN(2156017,1215587,81374,585789,1674517,607427,729625,1082779,1382789,623367,2079525,1146384,2002438,416917,378437,3521712,3339400,821029,636040,3147193,562539,557698,1211375,2233540,409667,3228518,81364,484851,2142091,720931) ORDER BY field (ArticleID,2156017,1215587,81374,585789,1674517,607427,729625,1082779,1382789,623367,2079525,1146384,2002438,416917,378437,3521712,3339400,821029,636040,3147193,562539,557698,1211375,2233540,409667,3228518,81364,484851,2142091,720931)