分数运算怎么做

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select * from tbl_Articles WHERE ArticleID=3345220 LIMIT 0,1
select * from tbl_Articles_data WHERE ArticleID=3345220 LIMIT 0,1
select * from tbl_Articles_sphinx where id=3345220 LIMIT 0,1
SELECT ArticleID,Title FROM tbl_Articles WHERE ArticleID IN(500006,374429,3429755,366299,519348,360358,513295,2445869,514557,464944,362954,559646,3033187,509355,484747,385489,1771838,446941,86935,100852,1097803,474656,484316,479745,149762,470493,2803271,405062,460266,408280) ORDER BY field (ArticleID,500006,374429,3429755,366299,519348,360358,513295,2445869,514557,464944,362954,559646,3033187,509355,484747,385489,1771838,446941,86935,100852,1097803,474656,484316,479745,149762,470493,2803271,405062,460266,408280)