后来居上的上是指什么

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select * from tbl_Articles WHERE ArticleID=1390489 LIMIT 0,1
select * from tbl_Articles_data WHERE ArticleID=1390489 LIMIT 0,1
select * from tbl_Articles_sphinx where id=1390489 LIMIT 0,1
SELECT ArticleID,Title FROM tbl_Articles WHERE ArticleID IN(1117401,1096128,3262586,698160,1146536,1121928,385565,1099723,1114676,879081,3024554,933634,388495,100382,1121284,1199163,887908,1082320,3067500,3266707,1105530,2523815,1824080,1110321,1096651,1471041,1105922,1070851,2808272,3285521) ORDER BY field (ArticleID,1117401,1096128,3262586,698160,1146536,1121928,385565,1099723,1114676,879081,3024554,933634,388495,100382,1121284,1199163,887908,1082320,3067500,3266707,1105530,2523815,1824080,1110321,1096651,1471041,1105922,1070851,2808272,3285521)