平方面积公式怎么算

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select * from tbl_Articles WHERE ArticleID=847671 LIMIT 0,1
select * from tbl_Articles_data WHERE ArticleID=847671 LIMIT 0,1
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SELECT ArticleID,Title FROM tbl_Articles WHERE ArticleID IN(1510947,1096619,1112867,447620,1275356,1068148,1133061,1127799,1126859,1118116,1063183,1086468,1123831,1121356,1081151,573716,1118148,1129543,1081897,1076523,1043756,1102468,1127229,1075807,1097743,1132129,1101407,1123961,1067939,3242232) ORDER BY field (ArticleID,1510947,1096619,1112867,447620,1275356,1068148,1133061,1127799,1126859,1118116,1063183,1086468,1123831,1121356,1081151,573716,1118148,1129543,1081897,1076523,1043756,1102468,1127229,1075807,1097743,1132129,1101407,1123961,1067939,3242232)