离合器到底什么时候用？

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select * from tbl_Articles WHERE ArticleID=2644932 LIMIT 0,1
select * from tbl_Articles_data WHERE ArticleID=2644932 LIMIT 0,1
select * from tbl_Articles_sphinx where id=2644932 LIMIT 0,1
SELECT ArticleID,Title FROM tbl_Articles WHERE ArticleID IN(475923,596126,3126400,642218,2644932,606706,515850,487499,394412,608981,600408,632137,2072281,1860203,410858,3087769,649688,469615,2191816,847177,1376274,1322349,618693,3490805,3239830,516311,576713,3368442,634439,420042) ORDER BY field (ArticleID,475923,596126,3126400,642218,2644932,606706,515850,487499,394412,608981,600408,632137,2072281,1860203,410858,3087769,649688,469615,2191816,847177,1376274,1322349,618693,3490805,3239830,516311,576713,3368442,634439,420042)