pr的嵌套系列起到什么作用

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select * from tbl_Articles_data WHERE ArticleID=781259 LIMIT 0,1
select * from tbl_Articles_sphinx where id=781259 LIMIT 0,1
SELECT ArticleID,Title FROM tbl_Articles WHERE ArticleID IN(1053074,1493289,1112004,1068874,1128901,1114236,1052683,1054991,1052415,1064119,1053584,1091625,1065773,1121018,1041607,1068150,1067627,1121684,1090663,1044426,1130714,1062530,1069019,1128475,1041639,994629,1048220,1063867,1104847,3272835) ORDER BY field (ArticleID,1053074,1493289,1112004,1068874,1128901,1114236,1052683,1054991,1052415,1064119,1053584,1091625,1065773,1121018,1041607,1068150,1067627,1121684,1090663,1044426,1130714,1062530,1069019,1128475,1041639,994629,1048220,1063867,1104847,3272835)