I am using Oracle Sql Developer Datamodeler to view table relationships as an ERD.
I have selected tables from the schema that are related and have common keys. Still Oracle Sql Developer Datamodeler does not show how the tables are related. Why?
I am suspecting that there is no foreign key relation in your table design.
If you have your relationships correct and still not showing the relationships, please disconnect and connect back the db connections in SQL Developer. You will be able to see the relationships properly
Related
I have the ability to generate an ERD from an entire DB. My DB is huge and I want to focus on a subset of table relationships. Is this supported in PGAdmin? Additionally, if it isn't is there a free/open-source tool that does support this?
I created an entity-relationship diagram (logical model) and engineered it to a relational model.
The tables were generated. Now I need to use them from the connection XE as you see in the picture.
The tables I made can only be seen on the data modeler design view in the "Browser", how do I get them on the connection "XE" to generate data dictionary, etc?
There are three possibilities:
you just need to expand the tables item in the tree to see your tables
You are looking in the wrong schema/user - go down to Other Users, and find the schema those tables belong to
The tables do not exist in the current database
If #3 is the issue, you would need to create them, possibly using the information in your Data Model - that is, you can generate the DDL/SQL scripts for those tables.
Then taking those scripts, run them while connected to the appropriate database/schema.
Disclaimer: I'm an Oracle employee and the product manager for these tools.
I just get a new project that need to work with a DB nobody knows about the structure about it. It is on the Mysql DB so I tried to use mySQL Workbench to export EER Diagram from this DB by using the Reverse Engineer function as many others recommended
I did get tables from the DB...but JUST tables!! no relationship that is the lines connect tables. Did I do something wrong or it is just because the ER Diagram from MySql Workbench is supposed to be like that?
Can anyone recommend tools that can export ER Diagram from existed DB? Include the relationship lines...
Relationships are only shown for foreign keys (how could MySQL Workbench otherwise know). If your tables have no foreign keys (e.g. because they are still using the MyIASM table engine instead of InnoDB) you won't get any relationships.
I am a DBA. I want to know what advantages my Business Objects developers will get when using EF with SQL Server DB which is fully managed using Foreign keys and Primarkey as and when require. As this is our new project and we have to use EF with SQL Server 2008 R2. We have a plan to use Database First Approach. Can anyone tell me what difference my Business Object developer will experience in case If I define all foreign Key relationships in my DB?
Assuming it's setup correctly, when your developers actually create their objects from the database structure, they'll be able to access any related tables rather easily.
It should also make creation of new objects (rows in the tables) easy, as it then shouldn't be possible to create new items that would break the foreign key relationship.
It's also just plain good practice to correctly setup any foreign keys in the database; I'm not sure of any benefit not to.
As a developer that's had to work with data sources that haven't been setup correctly, I can tell you a correctly setup database structure is an amazing experience for a developer.
(As an aside, as a DBA, you may want to take a look at EF. Also take a look at LINQ, one of the items that they'll be using. In particular, Why LINQ beats SQL may help you get a basic understanding, even if you don't agree with the article title :) )
Is there a tool that implements hyperlink-style navigation between tables via foreign keys? Web-based or native app.
For example, if I have table Users, with a column containing a foreign key reference to table Preferences, such a tool would implement simple 1-click access between the rows of the two tables, automatically creating links based on foreign keys.
I'm using MySQL, but I'm hoping for something that might work on multiple RDBMS systems.
I believe PhpMyAdmin will do this for you if properly configured.
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