为什么最小作用量原理如此重要

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select * from tbl_Articles WHERE ArticleID=141133 LIMIT 0,1
select * from tbl_Articles_data WHERE ArticleID=141133 LIMIT 0,1
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SELECT ArticleID,Title FROM tbl_Articles WHERE ArticleID IN(1090843,1044133,1859295,1132051,133307,1070824,1083265,2616741,1096747,486066,1700083,1305766,1100985,2299144,2152970,2934601,2909097,1110349,2509137,1082986,1069956,1275697,2282918,3086652,2439823,854910,1127311,1059186,3115244,1740614) ORDER BY field (ArticleID,1090843,1044133,1859295,1132051,133307,1070824,1083265,2616741,1096747,486066,1700083,1305766,1100985,2299144,2152970,2934601,2909097,1110349,2509137,1082986,1069956,1275697,2282918,3086652,2439823,854910,1127311,1059186,3115244,1740614)