四个9加起来为什么等于100

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select * from tbl_Articles WHERE ArticleID=3356033 LIMIT 0,1
select * from tbl_Articles_data WHERE ArticleID=3356033 LIMIT 0,1
select * from tbl_Articles_sphinx where id=3356033 LIMIT 0,1
SELECT ArticleID,Title FROM tbl_Articles WHERE ArticleID IN(342535,425726,1121004,772457,1112818,1103285,476797,1114496,1362964,357540,1104043,249409,2915126,526597,847003,1065569,812331,1277514,1073274,263162,492531,1047767,1126829,261089,976938,267948,1441096,1118751,1387305,603755) ORDER BY field (ArticleID,342535,425726,1121004,772457,1112818,1103285,476797,1114496,1362964,357540,1104043,249409,2915126,526597,847003,1065569,812331,1277514,1073274,263162,492531,1047767,1126829,261089,976938,267948,1441096,1118751,1387305,603755)