客观存在和不存在有什么区别

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select * from tbl_Articles WHERE ArticleID=2070898 LIMIT 0,1
select * from tbl_Articles_data WHERE ArticleID=2070898 LIMIT 0,1
select * from tbl_Articles_sphinx where id=2070898 LIMIT 0,1
SELECT ArticleID,Title FROM tbl_Articles WHERE ArticleID IN(1125210,1064511,1116813,1102036,1064085,1062582,1128771,1062706,1066909,1052749,1077569,1123827,1116015,1066810,1062254,1072278,1068148,1061320,1062364,1059352,1131867,1073722,988905,1051045,1053404,2819965,1060645,1128355,1062424,1076319) ORDER BY field (ArticleID,1125210,1064511,1116813,1102036,1064085,1062582,1128771,1062706,1066909,1052749,1077569,1123827,1116015,1066810,1062254,1072278,1068148,1061320,1062364,1059352,1131867,1073722,988905,1051045,1053404,2819965,1060645,1128355,1062424,1076319)