rdbms

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Having a foreign key as the primary key in a child table

In a One to Many association between a Parent T开发者_开发技巧able and Child Table. Is it ok to make the Foreign key on the Child table as the Primary key on the same child table.[详细]

2023-02-07 15:45 分类：问答
Why is MySQL used so often in web development?

I have often wondered why MySQL has become so popular. Any ideas why? Are there specific reasons behind its success? (Ple开发者_StackOverflowase keep answers analytical)[详细]

2023-02-06 02:42 分类：问答
What is the best (scalable, fast, reliable) approach to implement an Activity Feed, Messaging Queue or RDBMS or NoSQL DBs?

I need to build an activity feed (stream? A \"lifestream\" to be more accurate.) for a system similar (same) in resemblance to many popular social networking platforms. My initial attempt was to use a[详细]

2023-02-05 08:29 分类：问答
Store list of users who have voted and stop re-voting

I want to store the list of users who have 开发者_JAVA百科voted on an article. Also want to avoid same user from re-voting again.[详细]

2023-02-03 23:26 分类：问答
What other RDBMS should my open source Java persistence library support [closed]

Closed. This question is opinion-based. It is not currently accepting answers. Want to improve this question? Update the question so it can be answered with facts and citations by editing[详细]

2023-02-03 22:25 分类：问答
What is the interaction between Objective-C and RDBMSes like SQLite?

I would like to learn how to persist data to a RDBMS from Objective-C, and I don\'t really know where to start to learn this.Do I learn a RDBMS? Do I learn data modeling?[详细]

2023-02-03 21:49 分类：问答
Hibernate updating records and implementing listeners : getting only required attribute values for event.getOldState()

I am using Hibernate 3 as my persistence framework. Below is the sample hbm file I am using. <?xml version=\"1.0\"?>[详细]

2023-02-02 18:33 分类：问答
RDBMS - SQL Max Value of a column based upon another column's uniqueness

This is really difficult question to ask. So here goes. The following sql: select * from Survey_Answers[详细]

2023-02-02 12:04 分类：问答
Use Active Directory to store data

I\'m wondering if it\'s a sane idea to use Active Directory to store entities related to an application, when not all entity types are the traditional AD-entities such as organizational unit, user, gr[详细]

2023-02-02 08:10 分类：问答
Which has better performance?

I am thinking of database schema for post and its comments, in context of a social networking application and im wandering which开发者_开发百科 of these two would give better performance:[详细]

2023-02-01 21:37 分类：问答