什么是置换反应

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select * from tbl_Articles WHERE ArticleID=583746 LIMIT 0,1
select * from tbl_Articles_data WHERE ArticleID=583746 LIMIT 0,1
select * from tbl_Articles_sphinx where id=583746 LIMIT 0,1
SELECT ArticleID,Title FROM tbl_Articles WHERE ArticleID IN(1685455,894738,860473,2463790,1304635,86086,1104246,509824,2550692,2792107,1105932,971317,3013768,2029469,1119540,964125,727456,1353755,1088528,1112028,1111352,1204263,714982,1113882,594594,1098137,449715,1089328,796298,1085268) ORDER BY field (ArticleID,1685455,894738,860473,2463790,1304635,86086,1104246,509824,2550692,2792107,1105932,971317,3013768,2029469,1119540,964125,727456,1353755,1088528,1112028,1111352,1204263,714982,1113882,594594,1098137,449715,1089328,796298,1085268)