ThatJeffSmith

Tag: data modeling

Discovering Foreign Keys in Oracle SQL Developer Data Modeler

Columbus didn’t exactly discover America. And we’re not really going to discover your long, lost foreign keys. But, we’ll do our best to guess where they might be. Our data modeling tool is often the bearer of bad news – your database doesn’t actually have any referential integrity defined. Oh, it’s defined somewhere, in the […]

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12c Temporal Validity Support in SQL Developer Data Modeler

Today’s question: can I design a table that takes advantage of the new Temporal Validity feature in Oracle Database 12c? Today’s answer: ‘Yes.’ In a nutshell: Temporal Validity Support lets you associate one or more valid time dimensions with a table and have data be visible depending on its time-based validity, as determined by the […]

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SQL Developer Data Modeler, Pending Changes & Versioning

Oracle SQL Developer Data Modeler supports the one-gal design boutique shoppe and the mega-huge development team. It HAS a file-based repository (Subversion aka SVN.) You don’t have to use it, but you should. You can optionally store your designs and data dictionaries in a database for reporting purposes. I strongly recommend you do so. If […]

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More Fun with Data Modeler Diagrams

Everyone likes pictures. Generate a report without any pictures, graphs, or charts and see how many ‘likes’ you get at work. Everyone gets excited about data modeling, and in some circles, folks think that data models are synonymous with diagrams. But really, the diagram is just the ‘pretty picture’ you add to your office report. […]

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Adding Common Columns to Tables via Templates and Transformation Scripts

In Oracle SQL Developer Data Modeler, you can create a table in your relational design that stores columns that you want to be added to all of your other tables. Call it, ‘table_template.’ Now call the transformation script. Tools > Design Rules & Transformations > Transformations. Before After These are cool, but they don’t belong […]

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SQL Developer Data Modeler Screenshots

I’ve taken a TON of screenshots of both SQL Developer products to demonstrate features. I was playing around with Flickr to see if there was a better way to re-purpose this content other places. Here’s what that COULD look like. I have a few hundred more to add to this photo album. This is just […]

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Are Invisible Columns Really Invisible?

Today’s question: How are invisible columns treated with DESC, INFO and the GUI equivalent? Super quick, an INVISIBLE column is one that the user doesn’t see. They won’t be able to access it unless they know about it. Security by obscurity? No. Tom Kyte shows a few examples of the features usefulness, especially when adding […]

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‘Modeling’ View Dependencies in SQL Developer Data Modeler

Today’s question: Please let me know how can I represent relation between view and base table in ER diagram created using sql datamodeler version4. So I know what the person is getting at here. They want to see the dependencies. Generally speaking, there are no actual relations between views and tables. Exception: you CAN define […]

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Adding Columns to a Table in SQL Developer Data Modeler: Honor Column Order?

I have an employees table. Because it’s 1984, HR has decided we need to know Twitter handles, Facebook pages, and who knows what else. So let’s add it to our table. The dialog by default puts new columns at the bottom of the table. We’ll see why in just a moment. On a side note, […]

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Modeling Function Based Indexes in Oracle

@thatjeffsmith Is there a way to define a function-based index in #SQLDevModeler? — Kent Graziano (@KentGraziano) October 29, 2014 Function based indexes [DOCS] have been part of Oracle Database since at least version 8. Instead of just indexing someone’s name, you could also index the values returned by a function call over that name. Example […]

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Importing Your Data Dictionary to a new Oracle SQL Developer Data Modeler Design

I’ve shown how to drag and drop database tables from Oracle SQL Developer into a design. But I’ve never done a start-to-finish, blow-by-blow post on how to import your existing database objects into a data model with SQL Developer. So let’s do that now. Warning: Lots of pictures coming up. Want to import from SQL […]

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Data Modeling via Excel?

In SQL Developer if you use the Import Data feature from the main tree node, it will create a new table based on a delimited text or Excel file. We’ll look at the data and create some columns for you. In version 4.1, we’ll recognize numbers as numbers, dates as dates, and try to get […]

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