什么是参考系

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select * from tbl_Articles WHERE ArticleID=1498286 LIMIT 0,1
select * from tbl_Articles_data WHERE ArticleID=1498286 LIMIT 0,1
select * from tbl_Articles_sphinx where id=1498286 LIMIT 0,1
SELECT ArticleID,Title FROM tbl_Articles WHERE ArticleID IN(1098137,1083609,2900003,2710113,848639,1116924,1092303,999997,1102317,1093212,3071388,497914,2064646,656115,1120364,1113177,1116697,1175450,1024688,1082320,1688533,714982,363185,1105185,1081937,455729,778034,1090613,1093556,1204490) ORDER BY field (ArticleID,1098137,1083609,2900003,2710113,848639,1116924,1092303,999997,1102317,1093212,3071388,497914,2064646,656115,1120364,1113177,1116697,1175450,1024688,1082320,1688533,714982,363185,1105185,1081937,455729,778034,1090613,1093556,1204490)