c表示什么数集

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select * from tbl_Articles WHERE ArticleID=2884148 LIMIT 0,1
select * from tbl_Articles_data WHERE ArticleID=2884148 LIMIT 0,1
select * from tbl_Articles_sphinx where id=2884148 LIMIT 0,1
SELECT ArticleID,Title FROM tbl_Articles WHERE ArticleID IN(1063981,1071265,1049014,1086081,1074630,1091615,1068532,1068410,1062140,1080795,1077904,1047767,1075526,1072314,1078879,1085052,994619,1051045,1053204,1066872,1083951,1060875,1091731,1084673,1088479,1070330,1045946,1088546,1090699,1052739) ORDER BY field (ArticleID,1063981,1071265,1049014,1086081,1074630,1091615,1068532,1068410,1062140,1080795,1077904,1047767,1075526,1072314,1078879,1085052,994619,1051045,1053204,1066872,1083951,1060875,1091731,1084673,1088479,1070330,1045946,1088546,1090699,1052739)