什么是除2取余法

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select * from tbl_Articles WHERE ArticleID=3203225 LIMIT 0,1
select * from tbl_Articles_data WHERE ArticleID=3203225 LIMIT 0,1
select * from tbl_Articles_sphinx where id=3203225 LIMIT 0,1
SELECT ArticleID,Title FROM tbl_Articles WHERE ArticleID IN(1069027,1080441,1067035,1099583,1087833,1065533,1075714,3042375,1107789,1108377,1061838,1091123,1096120,1095576,1093290,1112132,1088570,1056968,1114435,1116777,1112702,1078438,1096388,1078194,1073437,1112114,1077080,1100723,1062646,1077778) ORDER BY field (ArticleID,1069027,1080441,1067035,1099583,1087833,1065533,1075714,3042375,1107789,1108377,1061838,1091123,1096120,1095576,1093290,1112132,1088570,1056968,1114435,1116777,1112702,1078438,1096388,1078194,1073437,1112114,1077080,1100723,1062646,1077778)