什么是必要条件

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select * from tbl_Articles WHERE ArticleID=1693837 LIMIT 0,1
select * from tbl_Articles_data WHERE ArticleID=1693837 LIMIT 0,1
select * from tbl_Articles_sphinx where id=1693837 LIMIT 0,1
SELECT ArticleID,Title FROM tbl_Articles WHERE ArticleID IN(814337,708406,2276800,1140876,1115811,938150,1969418,1102516,3114029,637914,1107390,1038466,963654,1109685,743233,1114190,1175273,1298881,593902,1044700,2900003,1094017,1115408,861815,2203114,1120364,1120896,514783,2949275,836218) ORDER BY field (ArticleID,814337,708406,2276800,1140876,1115811,938150,1969418,1102516,3114029,637914,1107390,1038466,963654,1109685,743233,1114190,1175273,1298881,593902,1044700,2900003,1094017,1115408,861815,2203114,1120364,1120896,514783,2949275,836218)