斜面为什么能省力

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select * from tbl_Articles WHERE ArticleID=1501491 LIMIT 0,1
select * from tbl_Articles_data WHERE ArticleID=1501491 LIMIT 0,1
select * from tbl_Articles_sphinx where id=1501491 LIMIT 0,1
SELECT ArticleID,Title FROM tbl_Articles WHERE ArticleID IN(1282802,1094089,379705,1115941,1117193,1093625,1089070,820058,1073899,170742,1092139,1078054,1126348,1069639,1085598,1102712,2175682,1067021,1087383,2105576,1881429,228994,1102112,1100931,361332,1368444,1043946,1098971,1308252,1059398) ORDER BY field (ArticleID,1282802,1094089,379705,1115941,1117193,1093625,1089070,820058,1073899,170742,1092139,1078054,1126348,1069639,1085598,1102712,2175682,1067021,1087383,2105576,1881429,228994,1102112,1100931,361332,1368444,1043946,1098971,1308252,1059398)