两个数的相对误差怎么计算.

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select * from tbl_Articles WHERE ArticleID=349943 LIMIT 0,1
select * from tbl_Articles_data WHERE ArticleID=349943 LIMIT 0,1
select * from tbl_Articles_sphinx where id=349943 LIMIT 0,1
SELECT ArticleID,Title FROM tbl_Articles WHERE ArticleID IN(1086348,1089742,1091625,1061328,1089820,1088822,1042815,1061610,1100799,1065049,1044565,1089626,1090517,1078873,1082962,1090663,1093641,1054676,1052677,1057656,1065131,1071595,1128631,1077639,1085390,1076199,1034501,960752,1066194,1091065) ORDER BY field (ArticleID,1086348,1089742,1091625,1061328,1089820,1088822,1042815,1061610,1100799,1065049,1044565,1089626,1090517,1078873,1082962,1090663,1093641,1054676,1052677,1057656,1065131,1071595,1128631,1077639,1085390,1076199,1034501,960752,1066194,1091065)