There are a lot of ER Diagram Tools. However, by far, one of the favourite ones I use is the ER Assistant which is also free. You can download the ER Assistant free software from here: ER Assistant Download. Install the program after download. In this post, we will learn how to Create Entities Create
In this short article, we look at a sample ERD Diagram which is designed using ER-Assistant software (usage of this software is covered here: How To Use ER Assistant) after we have finished with the Conceptual Modeling. Hence in the first place, we have to gather some Data requirements. This involves business logic and requirements,
Understading cardinality notation and being able to explain them will go a long way in your database design and implementation. Here we look at a simple explanation of the symbols. (Credit to Data Warehousing for Business Intelligence by University of Colorado System on Coursera) Symbols in the above diagram and their meanings: – Oval: means 0 –
Which Part of SQL Statements Execute First and in What Order. It is very important to understand which parts of the SQL Statement executes first and which part comes next until full completion. The diagram below gives an overview of the execution order. The steps in which the SQL statement is executed are as below:
ERDPLUS One tool I generally use when working on a projects, mini tasks and exploration is the ERDPLUS tool . It is quite simple and easy to use. It is a Free tool as well. Below are some diagrams I generated when i first got in contact with with tool. ERD DIAGRAMS: 1. 2. A
Creating Oracle tables for Intercollegiate Athletic Database. Part of Assignment one of Data Warehousing for Business Intelligence on Coursera –1 CREATE TABLE FACILITY CREATE TABLE FACILITY( FACNO VARCHAR(12), FACNAME VARCHAR(255) NOT NULL, CONSTRAINT PK_FAC PRIMARY KEY (FACNO) ); –2.REATE TABLE EMPLOYEE CREATE TABLE EMPLOYEE( EMPNO VARCHAR(12), EMPNAME VARCHAR(255) NOT NULL, DEPARTMENT VARCHAR(100) NOT NULL, EMAIL VARCHAR(50) NOT
The following are the main constraints which can be defined when you are creating a TABLE. I will be using the ORACLE DBMS . Primary key – The primary key of the table to be created. Foreign key – The primary key of some other table which is being referenced in this table to be
You can practise SQL live online for Free. Here are a list of some websites in no particular order. Oracle Live SQL. This site also has lots of examples and tutorials which you can see the codes right there and then SQL Fiddle: You can practise various SQL by major players here as well. w3schools:
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