relational

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Data Structure To Store Arbitrary Database Tables

I\'d like to design a JVM data structure (Java/Scala) that can be used to represent and store the contents of arbitrary relational database tables.The data structure should be fast (not too gc-intensi[详细]

2023-01-10 18:43 分类：问答
two resources with two different relationships in rails

I am new to rails, and have a situation that I can\'t quite get my head around. Lets say I have two resources, users and widgets.[详细]

2023-01-07 14:08 分类：问答
Correct way to model relational database

to explain my problem, I\'ll give a simple example: My database has three tables: [positions] - position_id INT[详细]

2023-01-04 13:11 分类：问答
Database design -- does it respect 3rd NF?

I have the following relations (t开发者_运维技巧ables) in a relational model Person person_id, first_name, last_name, address[详细]

2023-01-03 13:47 分类：问答
A table that has relation to itself issue

I\'ve defined table with this schema : CREATE TABLE [dbo].[Codings] ( [Id] [int] IDENTITY(1,1) NOT NULL,[详细]

2023-01-03 11:56 分类：问答
Using nodereference + views to create combined view

I\'m trying to set up a relational View but not sure how to do it. Here\'s an example of what I\'m going for using the node types Artist and Song.[详细]

2023-01-02 23:55 分类：问答
index 'enabled' fields good idea?

Content of a website is stored in a MySQL database. 99% of the 开发者_高级运维content will be enabled, but some (users, posts etc.) will be disabled. Most of the queries end as WHERE (...) AND enabled[详细]

2023-01-01 04:54 分类：问答
Limit a user to view only associated records in rails

I have an application with three Models (Profile -> SubModel -> SubSubModel) chained together with has many relationships. I am trying to limit a user, after logging in, to only retrieving records tha[详细]

2022-12-28 03:38 分类：问答
Can someone describe the nested set model from a C#/LINQ perspective?

I know the nested set model doesn\'t pertain to the C# language or LINQ directly... it\'s what I\'m using to develop my web app.[详细]

2022-12-23 15:40 分类：问答
Help to translate SQL query to Relational Algebra

I\'m having some difficulties with translating some queries to Relational Algebra. I\'ve a great book about Database Design and here is a chapter about Relational Algebra but I still seem to have some[详细]

2022-12-22 23:10 分类：问答