How to check table relationship in oracle

How to generate database documentation with Oracle SQL Developer - Oracle SQL Developer Tutorials

how to check table relationship in oracle

Oracle - SQL Table Basics - Table Relationships As long as we can determine the primary key of each of our tables, and what the foreign key relationship is. There are two ways to create a foreign key on a table in Oracle: the inline Join the DZone community and get the full member experience. how to extend your current MySQL or relational database to a Redis database. How to find your missing foreign keys in Oracle SQL Developer Data Modeler. So, assuming we have a primary key column in a table and Maybe those relationships aren't as strong as a FK would make it in the database.

If you would like to modify the appearance of the model just move objects on the pane. In my example I moved around some tables: Handling this case is a material for the next tutorial. Create smaller diagrams for large databases Data Modeler has an option called SubViews. SubViews, as the name suggests, is part of the whole model. If you imported a lot of tables and views, you might want to break your diagram into smaller, more manageable diagrams. This is where SubViews come into play. I have added two tables to my SubView.

Objects which you moved to SubView are the same instance as an object in the Relational Model so you can edit comments in both Relational Model and any SubView. Comments in RDBMS - holds information imported from the database if you update this field you will be able to export descriptions back to your database - this is a material for another tutorial.

This field has not limited length but if you exceed characters and will try to save descriptions back to the database the script will throw an error. Comments - holds descriptions which are saved only in the design file you are working with at this very moment.

how to check table relationship in oracle

Notes - are used to add additional information, and they will not be included in the exported documentation. Export includes only one description field - by default, it is Comments field. When using Comments in RDBMS keep in mind that you should not insert text longer than characters as it will cause an error.

Unfortunately the tool doesn't cant handle it properly nor tells you that you exceeded this length. Once you have added a description for a table, it is time to describe columns.

To see a list of columns select Columns on the left menu. You choose columns in the middle pane on the Details tab and provide descriptions of the text fields on the right pane.

how to check table relationship in oracle

Or from Overview tab. Comment as many elements as you need.

Modeling and Accessing Relational Data | Oracle Magazine

When you finish with the table close it with OK button. Note that your changes in your model file are not saved yet. After you modify table descriptions, they will be highlighted in a browser window in red. Save the file to keep your changes, if you close Oracle SQL Developer Data Modeler without saving it, you will lose all the changes made.

When you finish documenting your database, you are ready to export the documentation. I will describe how to do it in another article.

how to check table relationship in oracle

Try all types of exports to see which one suit you best. Most important options which you need to set are: Other is used to generate documentation of other models available in SQL Developer Data Modeler like Logical Model, but this is not part of this tutorial. Tables - only tables and diagrams will be included in the documentation. Table Views — only views and diagrams will be included.

Modeling and Accessing Relational Data

You might also have a look at other options: Report Title — title visible in the documentation. Report File Name — name of the file with documentation.

The selected checkboxes on the picture above are for you to decide if you want to show diagrams in your documentation and if you would like to page break between objects. Advanced options - documentation scope If you want to export all objects imported from the database and diagrams just skip this section.

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Besides standard configuration, you can create templates of export, where you can choose elements of objects which you want to show in your documentation. These three entities have the following cardinal relationship to one another. Logical table relationship The relationship between two tables can be expressed in meaningful terms.

In our design it is possible for a person to have many addresses. For example, we can have a home address, a work address, and of course our summer home in the Hamptons: A person can also have more than one phone number. The design also provides the user flexibility in defining how many addresses and phone numbers they wish to store.

Logical diagrams are essential and oftentimes omitted from a database design. They are essential because they clearly and graphically communicate our table relationships. Physical table relationship The physical diagram depicts the primary key and foreign key relationship between our entities.

Our primary table is "person". At present all we have are three separate tables we have created. These tables currently only have a semantic relationship to one another. We now need to create foreign key constraints in order to establish a bone-fide relationship between our three tables.

Creating a foreign key constraint The sole purpose of a foreign key constraint is to define a relationship between two tables.

how to check table relationship in oracle

Understanding Cardinal Relationships Knowing how foreign key constraints work allow us to understand how tables relate to one another. Some people really struggle with this area.

There is no need to struggle armed with a little bit of pertinent knowledge.

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