非负数和非正数各是什么意思

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SELECT ArticleID,Title FROM tbl_Articles WHERE ArticleID IN(1073100,1412959,1898705,2510031,1559690,1091615,1066622,1068664,1076277,2189240,1072082,1072809,1063735,1061534,1078595,1465483,1052287,1520284,1089560,1501958,1083059,1053404,1100211,2606672,1092724,1668643,1077348,1045655,1070270,1658775) ORDER BY field (ArticleID,1073100,1412959,1898705,2510031,1559690,1091615,1066622,1068664,1076277,2189240,1072082,1072809,1063735,1061534,1078595,1465483,1052287,1520284,1089560,1501958,1083059,1053404,1100211,2606672,1092724,1668643,1077348,1045655,1070270,1658775)