This article will discuss the step by step process on how to prepare the entity relationship diagram or ERD of the project entitled Project Management System. Project Management System is an information system that will manage the processes and transactions involved in monitoring and recording the updates of a project. The said project can be implemented in an offline settings but in most cases this is implemented in a live server or it simply means an online system. The first step in the development of the Project Management System is to prepare the ER diagram that will serve as the basis later on in the creation of the actual database. We will create and explain the process of making the entity relationship diagram of project management system. Let’s start from the symbols used in the ER Diagram. Entity is represented by the rectangle shape. The entity will be our database table of Project Management System later on. Attribute is represented by the oval shape. This will be the ...
I have very old application. Then I saw some store procedure using (+) or (-) notation on the query. What i want to ask are : 1. what is the difference between (+) and (-) notation ? 2. what is the difference between (the position of the notation I put on left or right) ? SELECT * FROM A, B WHERE A.column = B.column(+) and SELECT * FROM A, B WHERE A.column(+) = B.column 3. I read from forum that notation is only present for backwards compatibility because Oracle debuted it before the ANSI standard for joins. So is there any problem if I'm not change the notation to 'join' statement (ANSI standard) on my old existing query ? 4. Is it recommended or not using notation (+) (-) ? 5. How about the performance. It's good using (+) (-) notation or join notation ? and Chris said... The plus sign is Oracle syntax for an outer join. There isn't a minus operator for joins. An outer join means return all rows from one table. Also return the rows from the outer joined where th...
Install and Configure OBIEE 12c on Linux VM · 1 Today we are going to be installing Oracle BI 12c on our Linux Virtual Machine. If you have not already created an Oracle Linux VM, I wrote a blog on how to do this here . If you have not already installed Oracle Database 19c on your Linux VM, I wrote a blog on how to do this here . This blog also assumes that you have access to the sample HR dataset that comes pre-installed with Oracle Database 19c. I covered how to access this in the Oracle 19c installation blog that I mentioned above. Before we begin, I just wanted to say good luck and … Starting-up and opening the database If you have not already done so, log-in to your Linux instance’s GUI. Your screen should look like this. First, let’s start our listener and open-up our database. Open a new terminal window and execute the following command to start your listener, if it is not already started. If it has already been started, the terminal will let you know. lsnrctl s...
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