什么是混合运算

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select * from tbl_Articles WHERE ArticleID=2208010 LIMIT 0,1
select * from tbl_Articles_data WHERE ArticleID=2208010 LIMIT 0,1
select * from tbl_Articles_sphinx where id=2208010 LIMIT 0,1
SELECT ArticleID,Title FROM tbl_Articles WHERE ArticleID IN(1084563,1094393,1080363,1087693,1101319,1303381,1102814,1132383,1099583,1086063,1066612,1054136,1106142,1057545,1106697,1080913,1071701,1075777,1068334,1119800,1119239,1112901,1070848,1066810,1073437,1104707,1103851,1107857,1074892,1066852) ORDER BY field (ArticleID,1084563,1094393,1080363,1087693,1101319,1303381,1102814,1132383,1099583,1086063,1066612,1054136,1106142,1057545,1106697,1080913,1071701,1075777,1068334,1119800,1119239,1112901,1070848,1066810,1073437,1104707,1103851,1107857,1074892,1066852)