椭圆里的a与c到底是什么

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select * from tbl_Articles_data WHERE ArticleID=116938 LIMIT 0,1
select * from tbl_Articles_sphinx where id=116938 LIMIT 0,1
SELECT ArticleID,Title FROM tbl_Articles WHERE ArticleID IN(1120418,1072268,1068016,1093975,1092308,1064085,1065259,2823815,1064251,1042765,1093857,1083341,1074670,1125169,1056152,1063117,1066132,1059801,1450002,1113507,983947,1065091,1084303,1133243,1087693,1078100,1079546,1041958,1111604,1078182) ORDER BY field (ArticleID,1120418,1072268,1068016,1093975,1092308,1064085,1065259,2823815,1064251,1042765,1093857,1083341,1074670,1125169,1056152,1063117,1066132,1059801,1450002,1113507,983947,1065091,1084303,1133243,1087693,1078100,1079546,1041958,1111604,1078182)