什么是脱式计算

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select * from tbl_Articles WHERE ArticleID=2460398 LIMIT 0,1
select * from tbl_Articles_data WHERE ArticleID=2460398 LIMIT 0,1
select * from tbl_Articles_sphinx where id=2460398 LIMIT 0,1
SELECT ArticleID,Title FROM tbl_Articles WHERE ArticleID IN(694538,2989883,938150,2438523,1106416,1091029,1106158,1160682,1685455,830956,1121708,1090356,999699,1142876,1390333,1118705,632536,868727,411735,558369,2064646,1116097,1093961,1084453,861483,1104385,2653676,1096367,739777,526622) ORDER BY field (ArticleID,694538,2989883,938150,2438523,1106416,1091029,1106158,1160682,1685455,830956,1121708,1090356,999699,1142876,1390333,1118705,632536,868727,411735,558369,2064646,1116097,1093961,1084453,861483,1104385,2653676,1096367,739777,526622)