0
votes
0answers
16 views

What is the optimal way to get a tabular view from an Entity-Attribute-Model table?

Following up on my previous question, I have created a table for storing measurements of different physical quantities. The schema looks like this: CREATE TABLE sensorreadings ( time TIMESTAMP, ...
0
votes
2answers
30 views

primary_key problem in MySql view

I have 3 tables. and I want to create a view. There is no problem about generating SQL qeury and creating a view. but when I want to use this view in my web app it says me (LIKE THIS): "your view's ...
1
vote
1answer
61 views

Is deriving a value using multiple joins a good idea? [closed]

I am working on a university project. I need to create a database from conceptual to implementation. That allows customers to create an order with multiple products the specification says that we ...
1
vote
1answer
124 views

Where do caching servers conceptually fit in my architecture?

Given the simple well-known architecture below: Where (conceptually) does the caching server(s) sit?
2
votes
3answers
730 views

View Design Best Practices

When designing a view, would it be best to retrieve the ID fields where FK relationships exist between the joined tables the desired description field obtained through the FK id relationship both? ...
2
votes
2answers
3k views

Primary Key on a View

While answering this question How to add a Primary Key on a Oracle view? A lot of questions popped in my mind. 1. Is it advisable to have primary key in a view. 2. Why anybody be intrested in ...
13
votes
3answers
4k views

Is nested view a good database design?

I have read somewhere long time ago. The book states that we should not allow to having a nested view in SQL Server. I am not sure the reason why we can't do that or I might remember incorrect ...