什么是机制机制分多少种类型

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select * from tbl_Articles WHERE ArticleID=2778066 LIMIT 0,1
select * from tbl_Articles_data WHERE ArticleID=2778066 LIMIT 0,1
select * from tbl_Articles_sphinx where id=2778066 LIMIT 0,1
SELECT ArticleID,Title FROM tbl_Articles WHERE ArticleID IN(1091267,1067901,1068973,1103532,1115821,1102438,1090032,1098277,1048158,1093513,1094393,1005452,1083548,1095319,1084703,1075901,1111930,1076187,1085114,1101394,1108890,1097245,1093152,1068558,1078134,1087779,1077100,1297501,1082117,1063165) ORDER BY field (ArticleID,1091267,1067901,1068973,1103532,1115821,1102438,1090032,1098277,1048158,1093513,1094393,1005452,1083548,1095319,1084703,1075901,1111930,1076187,1085114,1101394,1108890,1097245,1093152,1068558,1078134,1087779,1077100,1297501,1082117,1063165)