计算不规则物体的体积有哪些方法

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select * from tbl_Articles WHERE ArticleID=276675 LIMIT 0,1
select * from tbl_Articles_data WHERE ArticleID=276675 LIMIT 0,1
select * from tbl_Articles_sphinx where id=276675 LIMIT 0,1
SELECT ArticleID,Title FROM tbl_Articles WHERE ArticleID IN(1079820,1088586,1074216,1053308,1069928,1060331,1084966,1275227,1086904,1103967,1088612,1092291,1077104,1072837,1132027,1055758,1083453,1133401,1009260,1128521,1042066,1092920,1093479,1084978,1066738,1066616,1056384,1041639,1064061,1058867) ORDER BY field (ArticleID,1079820,1088586,1074216,1053308,1069928,1060331,1084966,1275227,1086904,1103967,1088612,1092291,1077104,1072837,1132027,1055758,1083453,1133401,1009260,1128521,1042066,1092920,1093479,1084978,1066738,1066616,1056384,1041639,1064061,1058867)