估算和约等于的区别

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select * from tbl_Articles WHERE ArticleID=391284 LIMIT 0,1
select * from tbl_Articles_data WHERE ArticleID=391284 LIMIT 0,1
select * from tbl_Articles_sphinx where id=391284 LIMIT 0,1
SELECT ArticleID,Title FROM tbl_Articles WHERE ArticleID IN(447191,3474781,1180472,1789787,875780,3122094,975608,2875963,913437,402309,917694,1160188,869703,426661,364654,82417,515790,1356866,2173015,551174,642386,89162,409555,640178,399147,481498,1280389,965315,854423,389937) ORDER BY field (ArticleID,447191,3474781,1180472,1789787,875780,3122094,975608,2875963,913437,402309,917694,1160188,869703,426661,364654,82417,515790,1356866,2173015,551174,642386,89162,409555,640178,399147,481498,1280389,965315,854423,389937)