Tag: data modeling

Managing Different Physical Implementations of your Relational Data Model

Near the end of a product demonstration with a customer yesterday, someone asked how they could build physical models for each of their different environments using Oracle SQL Developer Data Modeler (SQLDev.) Imagine having a application and database setup ‘out of the box’ that adequately described your meta data. But, you might have one implementation […]

SQL Developer Data Modeler Quick Tip: Preferred Data Types

There are many data types to choose from when defining your table columns. The eighty percent rule tells us we can probably get away with a smaller subset of data types eighty percent of the time. Here is what the ‘TYPE’ control looks like in the modeler when defining a column: I was curious to […]

Visualize Your DDL Scripts

Data models sure are handy. They tell a story – how does the information get stored as data? Just what is a ‘customer?’ Sometimes though our applications die and only leave legacy scripts behind. Or maybe you are a DBA and someone has given you a set of scripts to create some new objects in […]

SQL Developer Data Modeler Quick Tip: Use Oracle JOIN Syntax or ANSI

New for version 3.1, currently available as a EA download, when defining the queries used to populate views, the modeler can generate JOINs using either Oracle’s or the standard ANSI compliant syntax. Let’s step back a second. When working with a VIEW defined in a relational model, the modeler has twp choices for defining the […]

SQL Developer Data Modeler Quick Tip: Hide and Resize

Ever seen a table with so many columns you wonder if the designer had fallen out of the de-normalization tree and had hit every branch on the way down? Oracle currently allows a max of 1,000 columns per table. Please do not test this limit. Maybe you do need that many columns, but I doubt […]

How To: Generate an ERD for Selected Tables in SQL Developer

Entity Relationship Diagrams tell a story. An employee is assigned one department. A location can house one or more departments. Jeff doesn’t have a boss because he is ‘the man.’ It can be challenging to understand the nature of your data by simply reading through the list of Foreign Key constraints for a table. Who […]

SQL Developer Data Modeler Quick Tip: Use SubViews

Modeling is cute when you’re in a class and the sample application is for a rotisserie league for fantasy football, or you need a shopping cart ordering system for online retail. You spend a few hours and might come up with several dozen tables. But what about in the real world when you are trying […]

You Know What Grinds My Gears? – Database Design Edition

I think one of the dirty secrets in the software business is how LITTLE feedback we get from our end-users. You know they are out there though, gritting their teeth, cursing the day someone trusted you with a keyboard and mouse. Some of this software is very expensive to boot, so one would expect these […]