求同存异是什么意思

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select * from tbl_Articles WHERE ArticleID=440297 LIMIT 0,1
select * from tbl_Articles_data WHERE ArticleID=440297 LIMIT 0,1
select * from tbl_Articles_sphinx where id=440297 LIMIT 0,1
SELECT ArticleID,Title FROM tbl_Articles WHERE ArticleID IN(1119540,100786,1106611,476025,366879,397225,468150,407732,1094757,1097857,478132,415766,1120187,1089766,1471041,408066,429595,438994,392883,1090613,1119852,1094497,495105,469489,388891,1297353,446793,1093535,1303492,1089750) ORDER BY field (ArticleID,1119540,100786,1106611,476025,366879,397225,468150,407732,1094757,1097857,478132,415766,1120187,1089766,1471041,408066,429595,438994,392883,1090613,1119852,1094497,495105,469489,388891,1297353,446793,1093535,1303492,1089750)