sql and pgAdmin3 Instructions Notebook

Excel Foundations, Regression, Optimization, Decision Analysis, Financial Modeling And Simulations， Advance Spreadsheet Modeling Instructions Notebook

R instructions and projects for beginners

when you want to copy/delete/modify some files, you may encounter the problem of insufficient privileges. The following message may occur: "Error, you need permission as administrators." So you can take following steps to get rid of it. 当你遇到权限不足的问题时，有以下方法可以尝试: