椭圆中的abc分别指的是什么

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select * from tbl_Articles WHERE ArticleID=2426950 LIMIT 0,1
select * from tbl_Articles_data WHERE ArticleID=2426950 LIMIT 0,1
select * from tbl_Articles_sphinx where id=2426950 LIMIT 0,1
SELECT ArticleID,Title FROM tbl_Articles WHERE ArticleID IN(1044867,1110730,1065331,1078983,1085542,1061328,1070498,993095,3279568,1064613,1076720,1074865,1085376,1126198,1054612,1113692,1062392,1062580,1127509,1061744,1113507,1091621,1091199,1087833,1884037,1132825,1053786,1071077,997352,1102298) ORDER BY field (ArticleID,1044867,1110730,1065331,1078983,1085542,1061328,1070498,993095,3279568,1064613,1076720,1074865,1085376,1126198,1054612,1113692,1062392,1062580,1127509,1061744,1113507,1091621,1091199,1087833,1884037,1132825,1053786,1071077,997352,1102298)