什么是中位数

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select * from tbl_Articles WHERE ArticleID=1051290 LIMIT 0,1
select * from tbl_Articles_data WHERE ArticleID=1051290 LIMIT 0,1
select * from tbl_Articles_sphinx where id=1051290 LIMIT 0,1
SELECT ArticleID,Title FROM tbl_Articles WHERE ArticleID IN(2900003,827838,1108355,1093358,1098733,1090356,1097299,776542,2932749,1290456,1116968,572554,389763,1090068,487449,2879727,399241,1353755,1819965,1095894,1115406,2048149,1100443,2873130,617824,797519,1081937,1727643,537125,809049) ORDER BY field (ArticleID,2900003,827838,1108355,1093358,1098733,1090356,1097299,776542,2932749,1290456,1116968,572554,389763,1090068,487449,2879727,399241,1353755,1819965,1095894,1115406,2048149,1100443,2873130,617824,797519,1081937,1727643,537125,809049)