为什么一个没有加减号的代数式可以看做一个数

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select * from tbl_Articles WHERE ArticleID=1079209 LIMIT 0,1
select * from tbl_Articles_data WHERE ArticleID=1079209 LIMIT 0,1
select * from tbl_Articles_sphinx where id=1079209 LIMIT 0,1
SELECT ArticleID,Title FROM tbl_Articles WHERE ArticleID IN(1086420,1092868,1129585,1064051,1095011,1113790,1057840,1088694,1078032,1086902,1093352,1042020,1081277,1092908,1066324,1064291,1083208,1085390,1099553,1125119,1096843,1090034,1069741,1099865,1060205,1064641,1044745,1087926,1077374,1045833) ORDER BY field (ArticleID,1086420,1092868,1129585,1064051,1095011,1113790,1057840,1088694,1078032,1086902,1093352,1042020,1081277,1092908,1066324,1064291,1083208,1085390,1099553,1125119,1096843,1090034,1069741,1099865,1060205,1064641,1044745,1087926,1077374,1045833)