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.
Related
I have a simple test setup:
A SQL Server (2017) with one database, with one table
A SQL Server Analysis Server (2017, with compatibility level 1400)
I have created a simple tabular model in Visual Studio with one datasource (the database with one table) and one table
This is my power query:
let
Source = #"SQL/MYCOMPUTER\SQLDEV;SampleDatabase",
dbo_testTable = Source{[Schema="dbo",Item="testTable"]}[Data]
in
dbo_testTable
I have deployed this tabular model to my SSAS instance...
Now my question: if the table in my SQL Server is updated (added records), how can I see these updates reflected in the Tabular Model? Do I have to rerun the Tabular Model somehow?
I have tried "Process Table" in SSMS on the Tabular model table, but it does not get the new records...
Processing a table processes whichever dimension or fact table you selected and this will only read data from the database objects used by this table. What processing is actually performed will depend on the type of processing that you used. As far as the question in the answer you posted, Process Full on an entire Tabular model will remove all data from the deployed model, then reload everything and process the hierarchies and measures as well, so yes the new data from the underlying tables will now be in the model for all tables within it after you processed it using this option. There are multiple processing types that can either be done at the database, table, or partition level. You can view additional details on these via the Microsoft reference.
I have found that on the level of the Database in the SSAS instance, there is an option "Process Database" that has an option "Process Full", which does update all the underlying tables.
But maybe there is a better way to do this?
I am following a SQL tutorial, it states
Database administrators often use relationship diagrams to help demonstrate how database tables are connected.
However,I tried every corner of mysql workbench but failed to find such a well-organized diagram.
How could I see the database structure as the diagram shows?
Looks like you didn't find the modeling part of MySQL Workbench yet. Walk through the tutorials to reverse engineer a schema and create an EER model from it.
You can customize colors and figure sizes + positions, organize a diagram with layers for better overview and change the notation (crow food etc.). Search for modeling with MySQL Workbench for more tips.
I learned long time ago database structure. But as I see on your picture, the diagram shows columns of tables and the relations between them.
1:N - means from the other table allowed to reference more than 1 records
1:1 - means from the other table allowed to reference only one record.
Example: relation between customers and orders.
The orders can have many customers_id and same customers as well. Because one customer can send more order.
You can find customer_id in order table too.
I was creating MySQL database to add medicine.I created a table and I need to add one more tabe.After creating it I tried to query the database from the sql workbench.But it donot show the table but it is present in the EER Model.How can I solve this problem.
Modeling is just the task of abstractly designing your schema and its objects (e.g. tables, views etc.). It does not actually create these objects. For this you have to forward engineer your model to a server (see Database menu). Once done you can use the Synchronization feature to update either model or server (or both) with any changes made.
But keep in mind this is only for the objects, not for any data.
Our database has about 500 tables we'd like to use in our EF model. Of those I'd be happy to start with 50 or fewer just to get our feet wet after working in plain ADO.net for years.
The problem is, our SQL server contains many thousands of other tables that exist in our database that have been created through the years and many that are dynamically generated. Believe it or not:
select count(*) from INFORMATION_SCHEMA.TABLES
73261
So that's a lot of tables. I have found that pretty much every tool I've tried to design, build or template EF models or entities either hangs or does not return a list of tables. Even SQL Server Object Explorer in VS2012 won't list the tables and instead shows the Tables folder with a little "x" over the icon. So I can't even select a subset of tables.
What options do I have for using EF? Is there a template where I can explicitly define the tables that I want to use entities for? Even with 50 tables, I don't want to hand code each one in an empty EDMX.
Using a Database / Code First approach and avoiding connecting Visual Studio to the database at all (i.e. don't create an edmx, or connect with server explorer) would allow you to do this easily. It does not give you any of the Model First advantages, but I think it sounds like your project would be better served with a Database / Code First approach anyway as:
You have an existing Model, and are not looking to push changes from your EDMX to the DB
You are looking to implement this on a subset of your database
This link has a good summation ( Code-first vs Model/Database-first ) with the caveat that in you case a Database/Code First approach does not have you pushing changes from code to the Database, so the last two bullets under code first apply less, and yours is a Database/Code First hybrid.
With 70k tables I think that any GUI is going to be tricky. When I am saying Database / Code First, I am trying to convey that you are not using the code to create / define and update your Database. Someone may be able to answer this more succinctly / accurately?
I now this is an old question. But for those who land here on a google search. The only tool I have found that actually works with thousands of tables is The Sharp Factory.
It is an ORM. Pretty simple to use. So if you are looking for an ORM that can work with a large number of tables and does not require you to write "POCOS" or "Mappings" or SQL then this is the tool.
You can find it here: The Sharp Factory
How is database normalization related to ER Modelling??
What comes first??
Or should both be implemented at the same time??
I feel modeling should come first in a highly normalized database design.
Creating the model allows you to think through how the tables will relate to one another and also allows you to envision what tables you'll need to use when writing your join queries.
Using a tool such as MySQL Workbench or Toad Data Modeler , depending on your target database vendor, can even generate SQL commands to build the tables, constraints, and indexes directly from the model. This is useful because it ensures the tables are created exactly as you designed them.
Also, when making changes to the model, some tools like those mentioned above will even allow you to "update" your schema by issuing the necessary statements required to do so.
So in short, for a project with more than one table, I'd always model it first. It also makes it easier for developers to understand how the tables function and relate at a glance rather than having to read through DDL to understand it.
Modeling can even be fun!
A model created with MySQL Workbench:
Hope this helps!