mysql多列索引(Multiple-Part Index)多個列上range scan時使用in

show create table 20130314t1 CREATE TABLE `20130314t1` ( `id` int(11) NOT NULL, `col1` int(11) NOT NULL, `col2` int(11) NOT NULL, PRIMARY KEY (`id`), KEY `key1` (`col1`,`col2`) ) ENGINE=Inno

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