复合运算与混合运算的区别

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select * from tbl_Articles_data WHERE ArticleID=612125 LIMIT 0,1
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SELECT ArticleID,Title FROM tbl_Articles WHERE ArticleID IN(1109040,1109935,1076541,1091097,1114784,986890,1119007,1072923,1096591,1065739,1049670,1059016,1084667,1304092,1108237,1078424,1095792,1072753,1063429,1102250,1090537,1106545,1129429,1113243,1060755,1113299,1082318,1044426,1041729,1063551) ORDER BY field (ArticleID,1109040,1109935,1076541,1091097,1114784,986890,1119007,1072923,1096591,1065739,1049670,1059016,1084667,1304092,1108237,1078424,1095792,1072753,1063429,1102250,1090537,1106545,1129429,1113243,1060755,1113299,1082318,1044426,1041729,1063551)