如何确定线段中点

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select * from tbl_Articles WHERE ArticleID=317086 LIMIT 0,1
select * from tbl_Articles_data WHERE ArticleID=317086 LIMIT 0,1
select * from tbl_Articles_sphinx where id=317086 LIMIT 0,1
SELECT ArticleID,Title FROM tbl_Articles WHERE ArticleID IN(1714321,109252,1093266,1768856,2353511,1074204,112864,107654,107724,1098967,1604020,1862981,1666506,2090671,3125077,108083,1611687,3398356,1066422,1073820,1102608,1065393,379869,111944,2906059,113621,2161229,1127027,487900,112697) ORDER BY field (ArticleID,1714321,109252,1093266,1768856,2353511,1074204,112864,107654,107724,1098967,1604020,1862981,1666506,2090671,3125077,108083,1611687,3398356,1066422,1073820,1102608,1065393,379869,111944,2906059,113621,2161229,1127027,487900,112697)