什么是二次推荐

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select * from tbl_Articles WHERE ArticleID=2520549 LIMIT 0,1
select * from tbl_Articles_data WHERE ArticleID=2520549 LIMIT 0,1
select * from tbl_Articles_sphinx where id=2520549 LIMIT 0,1
SELECT ArticleID,Title FROM tbl_Articles WHERE ArticleID IN(987495,1092712,1048112,1077782,1051403,1128469,1108840,1071041,1077240,1065589,1054674,1066564,1074184,1096120,1073399,1080171,1103342,1079437,1111504,1088490,1063165,1074820,1063735,1053494,1070614,1118040,1063237,1094191,1071701,1106599) ORDER BY field (ArticleID,987495,1092712,1048112,1077782,1051403,1128469,1108840,1071041,1077240,1065589,1054674,1066564,1074184,1096120,1073399,1080171,1103342,1079437,1111504,1088490,1063165,1074820,1063735,1053494,1070614,1118040,1063237,1094191,1071701,1106599)