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.Web Browser Control – Specifying the IE Version http://www.west-wind.com/weblog/posts/2011/May/21/Web-Browser-Control-Specifying-the-IE-VersionI use ... 阅读全文
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Solution 1:Add Unique Index on your table:ALTER IGNORE TABLE `TableA` ADD UNIQUE INDEX (`member_id`, `quiz_num`, `question_num`, `answer_num`);Solut... 阅读全文
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# sorting examples using the mtcars datasetattach(mtcars)# sort by mpgnewdata <- mtcars[order(mpg),]# sort by mpg and cylnewdata <- mtcars[order(mpg, 阅读全文