I am generating an ER Diagram by SQL Server, but the relationships between the entities are not pointing to the columns they are supposed to (just to the entities).
Is there an option that would connect the exact columns the foreign keys should point to or should I do it manually every time?
I do not think the diagrams in SSMS are able to do this. You will need to look at other tools to generate your required design such as Visio.
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To give some context I need help making a database on the Microsoft SQL Server Management Studio based on an ERD, I'm currently struggling on how to make different types of relationships between each table.
The relationships I have aren't what I need, and I can't change them to be mandatory one to many, etc.
My database of diagram of what I have
The ERD I'm using to make the database diagram
Every time I add the tables to the database diagram it gives me that type of relationship when I know I know I need different relationships instead, so overall I need help making the relationships in the database diagram match the ERD image.
Sidenote: I can't code the tables I have to use the database diagrams tool to make the tables the relationship.
What type of relationships are you needing?
Generally in SQL Server you can utilize Primary Key and Foreign Key relationships. I would consider scaling based on how the tables will be loaded and storage when designing.
Try adding an Employee-FK to the Computer object and a Computer-FK to the Software Package object.
I am trying to export 3 database (DB) diagrams from one DB to another using SSMS 17. I have tried the solution suggested here:
How to export a SQL Server 2008 Database Diagram to another DB?
This solution is also recommended in several other websites I have found so far, to copy the content of the table "sysdiagrams" from the source DB to the destination DB (3 rows in my case).
After doing this I can confirm that both "sysdiagrams" tables have the same content and the diagrams are imported in the destination DB. Nevertheless in each imported diagram I see only the tables but not the relationships. What I find strange is that the relationships are shortly visible while the tables in the diagram are being loaded. After all tables are loaded they just dissappear.
Does anyone know what the issue could be? It is my understanding, that this solution is successful for early versions of SSMS.
Any help is highly appreciated :) !
Check that the relations (Foreign Key constraints) actually exist in the target database, because if they don't then the diagram editor will behave exactly as you describe: initially it will draw all lines, then it starts looking for each FK relation that each line represents, and it will one by one remove lines for which relations are not found.
To clarify, you can create FK relations using the Diagram Editor by drawing a line between to tables (the editor then creates both a line in the diagram and the actual FK constraint). But with a 'copy diagram' action like yours, you copy only the line data but not the actual relations.
To add the missing relations in the target database you could write ALTER TABLE ... ADD CONSTRAINT ... statements, or use the Diagram Editor again on the target database, or you can try using a database diff tool.
I have a lot of views and tables connected in Microsoft SQL Server. I want to check all the useless columns I have in the native tables. Is there a way to perform an automatic check if a column in a table is used or not in other tables?
Create a database diagram in SQL Server Management Studio. From here you can analyze how the tables/columns are related or not. Info here
Do a business model analysis and see which values are used, which are deprecated and start from there.
If you do any changes on the database, these changes have to be projected in any code connecting to that database.
Do not remove columns in tables just by looking at a database diagram. You would destroy any object-relational mapper.
I just have this simple question. in SQL Server Management Studio there is an option Database Diagrams, is it ER diagram ?
No I believe.
ER diagram does not refer to relational data model and can be mapped into different data structures.
SQL Server diagram is specific only to relational model and DBMS.
Yes, you can do a database diagram.
Expand DataBases --> choose database--> database diagrams --> right click(NEW DB diagram).
SQL Server let you create a Physical data model Diagram that could come from a ER Diagram or not. An ER Diagram is more abstract.
The diagram produced by SSMS is not an Entity Relationship diagram.
It is a very useful tool, and does model the relationships that physically exist between tables, but is missing a few key features of ER diagrams.
Can anyone give me an idea about database flow diagram in my SqlServer Server Management Studio? I have a database (ERBIA) in my server; I want to know about the database relationship among different tables.
You can simply click on this:
And then select the tables for which you wish to create diagrams (graphs)
By database flow diagram I think you mean an Entity Relationship Diagram (ERD). There are a number of 3rd party tools that exist to create ERDs. ERWin, Visio, ER/Studio are some examples.
These tools can read the database schema information and create a diagram and draw relationship lines based on the Foreign Key constraints. You can edit the diagrams and depending on the tool update the database or generate a DDL script for the database changes.
SQL Server also includes a database designer, but it should be noted there is no separation from a logical model and the physical model. This means if you draw a line from one table to another indicating a relationship a FK will actually be created when you save the diagram. For some scenarios this would be a problem.