Precautions for MySQL aliasing database tables

R语言数据导出（数据保存、导出、持久化到本地指定目录文件）、使用xlsx包的write.xlsx函数将dataframe导出为excel文件xls格式、而非xlsx格式

mysql设置2个主键

R language uses cor function to calculate the correlation coefficient between multiple numerical data columns in dataframe and Pearson product moment correlation coefficient

R语言使用plot函数可视化数据散点图，使用par函数中的bg参数自定义设置可视化图像线框内的背景色

The R language uses the plot function to visualize the data scatter diagram, and uses the BG parameter in the par function to customize the background color in the wireframe of the visual image

MySQL的优势

mysql主键id自定义

Program design TIANTI race l3-29 restore file (DFS is over, leaving the original spectrum)

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易鲸捷数据库将获得中国软件投资，不超过3.89亿元

338-Leetcode 同构字符串

29. There are 1, 2, 3 and 4 numbers. How many three digits that are different from each other and have no duplicate numbers

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Program design TIANTI race l2-007 family real estate (it's too against the sky. I always look at the solution of the problem, resulting in forgetting the problem and looking up how to write the collec

R语言使用cor函数计算dataframe中多个数值数据列之间的相关性系数、计算Kendall’s Tau非参数的等级相关性系数

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Win10 bridging network card enables QEMU virtual machine to access the network normally

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2-4. Port binding