什么是偏正结构

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select * from tbl_Articles WHERE ArticleID=206307 LIMIT 0,1
select * from tbl_Articles_data WHERE ArticleID=206307 LIMIT 0,1
select * from tbl_Articles_sphinx where id=206307 LIMIT 0,1
SELECT ArticleID,Title FROM tbl_Articles WHERE ArticleID IN(1067351,1081411,1119331,1057028,1080383,1073397,1042765,1086832,1114502,1054674,1132383,1067327,1117620,1112871,1064833,1066852,1071645,1053494,1068258,1068154,999794,1080118,1101319,1099985,1056858,1086928,1073100,1108255,1115821,1107687) ORDER BY field (ArticleID,1067351,1081411,1119331,1057028,1080383,1073397,1042765,1086832,1114502,1054674,1132383,1067327,1117620,1112871,1064833,1066852,1071645,1053494,1068258,1068154,999794,1080118,1101319,1099985,1056858,1086928,1073100,1108255,1115821,1107687)