中位数是什么意思

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select * from tbl_Articles WHERE ArticleID=1179562 LIMIT 0,1
select * from tbl_Articles_data WHERE ArticleID=1179562 LIMIT 0,1
select * from tbl_Articles_sphinx where id=1179562 LIMIT 0,1
SELECT ArticleID,Title FROM tbl_Articles WHERE ArticleID IN(412388,1116553,1087747,387812,446371,1107491,1113177,100801,376015,428709,450676,422302,379518,448899,392969,1116589,976183,448357,1094307,1095277,1111356,419863,398241,3154366,1115245,406421,3072581,3205157,1119540,1086618) ORDER BY field (ArticleID,412388,1116553,1087747,387812,446371,1107491,1113177,100801,376015,428709,450676,422302,379518,448899,392969,1116589,976183,448357,1094307,1095277,1111356,419863,398241,3154366,1115245,406421,3072581,3205157,1119540,1086618)