For questions about structuring the data within a database. How to lay out tables, whether to use a relational DB or not, etc.

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1answer
76 views

How to associate both a collection and one item of this collection to an entity

I'm working on a project in which I have an entity, we may call Users and another entity Address. I want to define the entity User in a way that an user would have a collection of addresses ...
5
votes
2answers
291 views

Database Normalisation - stuck with “categories”

Context: I'm working on a database of museums and Categories will be one way the user will be able to search. e.g click on "Music" and a list of music related museums turn up. Pretty simple. ...
3
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1answer
431 views

How to store a potentially large amount of optional properties of objects?

I'm using Entity Framework Code First with ASP.NET MVC. This handles my database design based on the domain models within my application. As it stands, the engine I'm writing will have a website ...
3
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2answers
109 views

Database Design for Inheritance

In my project I have an object Player (attr example: pl_id, pl_data1) that is one of these types: Its GoalKeeper (attr example: gk_data1) OR Defender (attr example: df_data1) OR Forward (attr ...
0
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1answer
102 views

is there anything called logical schema and the conceptual schema of a database table?

i want to know whether there is anything called logical schema and the conceptual schema of database table. if so what is it.i searched lot of places for this specific two words, but did not find ...
0
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2answers
98 views

combining user data from user table and user_profile table to just one table [closed]

We are using two table to manage user data. A user table that has a username, email, password. Then a user profile that has first name, last name, bio, etc. Due to some other requirements it has been ...
2
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0answers
115 views

Best approach for displaying a price from a product according the “setup”? [Designing the DB table and relations]

I'm basically building a reseller website, in which people can buy (users) from a predefined product list and sell them at a higher price (clients). I will show you some images to explain better ...
2
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3answers
2k views

Best approach for an online store which changes its product’s price over time? [Designing the DB Table]

I am currently creating a website which will allow people to buy consumer products (deodorant, shampoo, toothpastes, etc…) from a store. Those products tend to change price and other details twice per ...
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1answer
123 views

Representing list of polymophic objects in db

Let's suppose I have a list of derived objects from some base: class Circle : public Shape; class Rectangle : public Shape; There is object, which has vector of Shape * as member variable: class ...
0
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2answers
581 views

Optimal Database design for 3-way relationship

All right, I know this sounds complicated, but all relationships are, lemme clarify. Well, I have three entities in my database which are tied to each other in a string of relationships, the app is ...
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2answers
189 views

How to minimize networking cost of distributed game database?

We've been working on a networked online game project which will run in near future and looking for a satisfying solution for our distributed game database. We didn't take networking costs into ...
0
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1answer
152 views

Best solution for future maintenance of a website with hardcoded ids, custom CMS using bad database design [duplicate]

Recently I was put into a position of a tech-lead on a very interesting project that I have been partially working for two years. This project carries a lot of legacy stuff with it even though we try ...
0
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1answer
191 views

Naming a recursive association entity [closed]

For my current project, I need to create a database table to store a recursive association. I've done a lot of searching and have read answers on questions, such as Naming convention for associative ...
1
vote
1answer
256 views

Data model for persisting queries to database

I have been asked to build what is essentially a query builder for a reporting application. The variety of objects to query, potential modifiers, number of conditions, and so forth to be reported on ...
1
vote
5answers
358 views

Database design with performance issue and use of views

I am designing database for a school system. I am having to create a lot of tables and a lot of link tables to maintain a structure in the system. I am trying to maintain foreign integrity and trying ...
1
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1answer
184 views

How to save appointments in database?

There are 2 entities. One is admin. The task of admin is to define slots for appointments which will be taken by applicants. The admin will choose a default time for the appointments like 10am to ...
4
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3answers
647 views

Is MongoDB appropriate for systems that will be likely to change?

I've been using MongoDb (mainly with Meteor) and for me, it has been a great way to mock up prototypes and proof of concepts quickly. I'm just wondering, after building the initial product, if your ...
1
vote
1answer
62 views

Storing and presenting custom table data

I have a web site upon which I want to provide users the ability to create tables of data. These tables will come from a predefined list of table definitions of which I will be adding to myself. This ...
0
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1answer
151 views

Single database, multiple system dependency

Consider an environment where we have a single, core database, with many separate systems using this one database. This leads to all of these systems have a common dependency, which ultimately ...
0
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1answer
82 views

Does this Relational Database Model make sense?

Here is a flat version of my datamodel. It is sensor readings for various data acquisition equipment. ...
4
votes
2answers
501 views

Would these two scenarios be good candidates for a NoSQL database?

I've checked a few other threads around the topic and search around, I am wondering if someone can give me a clear direction as to why should I consider NoSQL and which one (since there are quite a ...
0
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0answers
36 views

Implementing multiple tables for the same entity due to processing power on Client apps

I reached a design/architectural issue on the large application I'm working on, at the point of writing possibles solutions on a chalkboard. Our product consist of a client-server information system ...
1
vote
1answer
398 views

Entity-Attribute-Value table vs single table for storage of posts, events and pages

I am trying to decide whether to just use individual tables with more fields for storing posts, pages and events or using tables with basic fields plus having EAV tables as well for fields that are ...
1
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2answers
217 views

Patterns for undo in multi-user applications on relational data

I want to build a web application that will allow multiple users to collaboratively populate the contents of a fairly conventional relational database. (The database will have a fixed schema, which is ...
0
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0answers
63 views

Extending database model of ORM in subproject

I have a maven project which contains some entities which are stored in a database. The purpose of this project is to manage personal information, users, locations, etc. This project can work on its ...
1
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0answers
36 views

how to reduce or stop duplication of relation's entry in treeview

I want to create tree-view for display or show family member's relation. For this I created 3 tables i.e following. familyDetails->[f_id,fname,lname] relations -> [r_id,relation] .....//e.g ...
0
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2answers
67 views

Data model - inheritance

I just started working on a project where I am trying to implement some backend logic which includes creating a data model for the given problem. Here is a problem I came across and I am curious what ...
0
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2answers
80 views

Changing an int to be a string in PHP / MySQL Schema

Background I'm trying to decide the best way to manage a change in requirements. Currently when an admin is assigned to a ticket, the ticket header record is given an owner and the ownerID field is ...
3
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0answers
157 views

What's the canonical way to store translations of user data?

I've developed some software that allows my users to attach a blurb to some non-language specific information: Pseudocode model: item(): ID creationdate byline //Only one byline for the object ...
3
votes
4answers
294 views

Creating menu structure using DB - is that fine?

I have an application that basically consists of a lot of screen so user needs to navigate a lot (like go from A>B>C>D) etc. I have been thinking how to implement this (mainly hold the structure of ...
2
votes
2answers
206 views

Database design with “draft” version of data

The database I'm currently building is pretty traditional relational database stuff, but there is one requirement that is not clear to me how model appropriately. There are many business rules which ...
3
votes
5answers
461 views

Is it useful to keep 'definition' entities in a database vs using an enum?

In a project that I have started working on, the database has a lot of FooDefinition tables which act like an enum. It's a C# project using Entity Framework although that is not central to the ...
1
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4answers
575 views

Are there any benefits in not having referential integrity keys in database?

So Referential integrity is good, but are there scenarios where not having constraints is better? For example when all the logic of relationships is kept in code? or when the database upgrade is ...
2
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4answers
443 views

How should I approach this from a problem-solving point of view?

I'm currently working on a project to replace some excel worksheets. There is a lot of industry specifics that change quite often and nobody really knows how things should be but every sure enough ...
0
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3answers
134 views

Help with database design with a strict and structured subset of clinical data

I'm developing an application to keep some of the data in chronic patients, the data came from a very strict subset of data, vital signs, exams, ecc. On a first glance I thought to create a Patient ...
2
votes
1answer
471 views

How to model a one-mandatory-of-many relationship

I have following class model that I'm quite happy with: A Whole has a special mandatory Part. Furthermore it has a collection of parts, that contains at least the mandatory part, but may contain ...
1
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2answers
248 views

Databases and the single responsibility principle

Can the single responsibility principle be applied to databases? relational databases I mean. I'm asking this because a typical database will have several tables and we may find something like that ...
2
votes
1answer
736 views

How to define item level permissions in a relational database

I need to model a database design to provide item level permissions to users based on the user's role access. I am using asp.net with sql server 2012 I am looking at similar experience on how ...
2
votes
2answers
145 views

Should I be using a composite key for this table?

My database is going to store words, so the Word table is the most important. The Rhyme table lists which words a particular word perfectly rhymes with. It consists of three fields: RhymeID - primary ...
0
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1answer
133 views

Store Arbitrary values related to mysql record

I have created an app that manages a Data cleansing workflow. Each row imported needs to store an arbitrary number of key value pairs in addition to our standard mysql schema. The key values need to ...
3
votes
4answers
787 views

Is this database design sound and fully normalised?

I'm creating a database to store words. The intended usage is to query the database to find a word matching a set of filters. E.g. if I wanted to find a word with < 10 letters, < 3 syllables, ...
0
votes
1answer
331 views

What's the best way to store options with multiple/boolean choices in an Android app?

I'm working on an Android social app which connects to a Postgresql database for up-to-date user data and is going to use lookups for dropdown menus, and these lookups will either have multiple ...
2
votes
1answer
3k views

When deciding a Primary Key, can I use Date part of a DateTime field

I'm designing a payroll system I have designed a database with several tables and this question is related to following tables EMPLOYEE (Employee_ID [pk], Name,... etc) LOCATION (Location_ID [pk], ...
1
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3answers
248 views

Are Data Warehouses bespoke products that are tailored towards the specific needs of one single organisation?

Are Data Warehouses bespoke projects that are developed to meet the needs of a specific organisation or can you buy off the shelf products that would meet the needs of many organisations? I am ...
1
vote
1answer
107 views

How to Structure a Trinary state in DB and Application

How should I structure, in the DB especially, but also in the application, a trinary state? For instance, I have user feedback records which need to be reviewed before they are presented to the ...
1
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2answers
104 views

How can you predict the time it will take for two processes in two different machines in a cluster to communicate?

I am trying to develop a computing application which needs a lot of memory (>500gb). Buying a single machine for that is overly expensive. I can, though, buy ~100 small instances on Digital Ocean or ...
1
vote
3answers
362 views

How to design database having multiple interrelated entities

I am designing a new system which is more of a help system for core applications in banks or healthcare sector. Given the nature of the system this is not a heavy transaction oriented system but more ...
1
vote
1answer
69 views

storing map template in database

I am working on an application that displays choropleth maps. These maps are of all different types, some display state by county, country by state/province, or world by country. How should I ...
2
votes
1answer
185 views

Serialized values or separate table, which is more efficient?

I have a Rails model email_condition_string with a word column in it. Now I have another model called request_creation_email_config with the following columns admin_filter_group:references ...
1
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1answer
264 views

Can I use access used by Visual Basic for building a database [closed]

I am the only programmer where I work (summer job) and I am a student with only a few years of programming experience. So I was asked to build a database and I am very excited about this project ...