Ahmed Ghazey

Al Salmo Aliko . Hello, in this post I'll discuss with you how to design good Entity Relationship Diagram ERD . this article for: IT Students learning about database. you are having difficulties in creating ERD. you are developer that need help in database design.   let's ask ourselves Why good database design is good ? or why we need ERD?         when I started programming Eng / Eman Ahmed was my First teacher, she said you must write your code with pen, and now I told you good database design start with paper and pen or in technological terms start with ERD, ERD is the model which shows logical layout of your database. let's List some advantages of good database design : very low or no redundant data is stored.  supporting planed or unplanned queries. good design easy to maintain and modify. from first glance you can understand it. an ERD consist from Entities and relationships between them; there exist many notation in textbooks and all are right I

I faced many problems when installing OpenCV on eclipse, so I decide write this tutorial . I'll explain steps in Order : 1- Open eclipse create new empty project (C or C++ project). 2- make sure that  "MinGW"  toolchain is selected . 3- press next . 4- right click on project -> properties . 5-Under "C/C++build "  section select -> setting , then select "tool setting " tab, Then select the "Includes" folder (on older versions of eclipse it is the "Directories" folder) in the GCC Compiler branch and add the opencv include directory to Include paths (-I): "C:\OpenCV2.1\include\opencv\", of course you have to change the directory if you install OpenCV in another place. 6- Now, under the MinGW Linker select the "Libraries" folder and add the following to the Libraries (-l) section (note not all of these are necessarily needed for your project but these are all the libraries available in opencv. cv2