什么叫对称分量法它有何用处

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select * from tbl_Articles WHERE ArticleID=357726 LIMIT 0,1
select * from tbl_Articles_data WHERE ArticleID=357726 LIMIT 0,1
select * from tbl_Articles_sphinx where id=357726 LIMIT 0,1
SELECT ArticleID,Title FROM tbl_Articles WHERE ArticleID IN(1072028,1129045,1074216,1052121,1129351,1060241,1047980,1091757,1004919,1132115,1070038,1070977,1066170,1074744,1057770,1073772,1041283,1074276,1095319,1074788,1085882,1075744,1070888,1106609,1074888,1064085,1062254,1047083,1079131,1069944) ORDER BY field (ArticleID,1072028,1129045,1074216,1052121,1129351,1060241,1047980,1091757,1004919,1132115,1070038,1070977,1066170,1074744,1057770,1073772,1041283,1074276,1095319,1074788,1085882,1075744,1070888,1106609,1074888,1064085,1062254,1047083,1079131,1069944)