哪些情况不属于不当得利

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select * from tbl_Articles_data WHERE ArticleID=3097887 LIMIT 0,1
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SELECT ArticleID,Title FROM tbl_Articles WHERE ArticleID IN(1105049,1104033,2603469,1071089,1068148,1112428,653387,1102176,1102438,1132565,448524,2997202,347058,1127469,1066296,1097531,1125064,1056160,621323,252140,1094607,501582,330362,558608,1077208,312281,386386,1080717,1121164,534226) ORDER BY field (ArticleID,1105049,1104033,2603469,1071089,1068148,1112428,653387,1102176,1102438,1132565,448524,2997202,347058,1127469,1066296,1097531,1125064,1056160,621323,252140,1094607,501582,330362,558608,1077208,312281,386386,1080717,1121164,534226)