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2
votes
1answer
51 views

Getting posts from users that are being followed: two different implementations

I have two different implementations for retrieving posts from the users someone is following and I want to know which one you would recommend using. First I'l show you the tables, and then the two ...
0
votes
1answer
56 views

How is called the reciprocal operation of the join on two tables

Consider two tables in a relational database 1|A 2|B 1|X 1|Y 2|Z whose join on the first column is (if we drop the column used for the join) A|X A|Y B|Z How is called the converse operation ...
-1
votes
1answer
79 views

Relational Model to NoSQL model

I'm trying to switch my brain in to a NoSQL mode (document oriented database). I created a JSON datastructure that looks a little bit like this { "listInstances" : [ { "listClassId" : 1, ...
2
votes
0answers
79 views

Building a generalized notification system: passive vs. active

Recently, I've tried my hand at building a notification system, but I quickly found that notifications are tricky things, especially in the context of building a general model. The diversity of what ...
2
votes
0answers
232 views

Is this a good implementation of mongodb for a money management tool?

I have a money management tool which has users. Each user may have several accounts/funds (e.g. bank account). For each account/fund there may be thousands of transactions. Users may only view their ...
2
votes
0answers
309 views

Redmine - Database Structure/Normalization

I am using redmine for project management and issue tracking. I was looking at the database tables and the underlying structure and was wondering if anyone who is experienced with database ...
0
votes
0answers
26 views

Should I use weak entity instead of regular to describe my kind of components?

First time trying to make a E/R model of my database. Trying to understand weak entities and regular entities. Should I make the CPU, RAM, Mainboard, etc. entities weak instead of regular?