什么叫二次梁

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select * from tbl_Articles WHERE ArticleID=194139 LIMIT 0,1
select * from tbl_Articles_data WHERE ArticleID=194139 LIMIT 0,1
select * from tbl_Articles_sphinx where id=194139 LIMIT 0,1
SELECT ArticleID,Title FROM tbl_Articles WHERE ArticleID IN(1081187,1063735,1078521,1047767,1010909,1086514,1048474,1073937,1065741,1063191,1075977,1077100,1063981,1070997,1070530,988570,1067933,1081123,1082980,1086063,993095,1077826,1074534,1078102,1041283,1107513,1086832,1074670,1080677,1052245) ORDER BY field (ArticleID,1081187,1063735,1078521,1047767,1010909,1086514,1048474,1073937,1065741,1063191,1075977,1077100,1063981,1070997,1070530,988570,1067933,1081123,1082980,1086063,993095,1077826,1074534,1078102,1041283,1107513,1086832,1074670,1080677,1052245)