定频和变频有什么区别

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select * from tbl_Articles WHERE ArticleID=624703 LIMIT 0,1
select * from tbl_Articles_data WHERE ArticleID=624703 LIMIT 0,1
select * from tbl_Articles_sphinx where id=624703 LIMIT 0,1
SELECT ArticleID,Title FROM tbl_Articles WHERE ArticleID IN(1100326,1111168,1090951,1115217,1095285,1090266,1099401,1089648,1092085,1105992,1100709,1107933,1087743,1099529,1107553,1116507,1101551,1090853,1084741,1133415,1104535,1122376,1089872,1101653,1114620,1091400,1104381,1132863,1116137,1115215) ORDER BY field (ArticleID,1100326,1111168,1090951,1115217,1095285,1090266,1099401,1089648,1092085,1105992,1100709,1107933,1087743,1099529,1107553,1116507,1101551,1090853,1084741,1133415,1104535,1122376,1089872,1101653,1114620,1091400,1104381,1132863,1116137,1115215)