The logical model and/or physical design of a database.

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Constrain referenced rows to two different tables to belong to the same row in another table

Apologies for the potentially confusing question title. I struggled to make it generic! I am designing a wildlife recording database. An observer goes to a site and records the occurences of species ...
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116 views

Proper design of routes in Database MySQL

I'am trying to find out the best database design and try to stick with data integrity by using Foreign Keys. But I'm stuck right at the beginning because of limit relations between tables with FK to 1....
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130 views

Should I use SQL Azure to store product descriptions and links to images in Azure Blob

For an html/Css/JQuery public Azure website to be coded using Zurb Foundation html5 responsive framework, I'd like to use SQL Azure (web edition) to store product descriptions and links to images that ...
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2k views

Database design: Normalizing a “(many-to-many)-to-many” relationship

Short version I have to add a fixed number of additional properties to each pair in an existing many-to-many join. Skipping to the diagrams below, which of Options 1-4 is the best way, in terms of ...
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81 views

Single table row “sharding/versioning” to customize values

Introduction Hello everyone, I have done quite a bit of searching and I cannot find a solution for my specific issue. There are a few factors that complicate my situation, which I have outlined below,...
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376 views

Problem with Database for survey Questionnaires

Bellow I am showing a sample survey question for woman. I need your help to creating a Database. Description: Top part of the survey Questions are Project Code, Name... etc which is ...
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1k views

which role-permission database design?

I want to manage roles and permissions. Most of designs on web look like this tables: Users Roles UserRoles Permissions RolePermissions Here, what is permissions? I am thinking for such a design ...
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151 views

Two different ON DELETE paths, how do I need to change the schema?

For a project in school I'm designing a website that sells items via auctions. Think eBay, but on the complexity scale of school project. We went through the process of making an ER Diagram and ...
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132 views

Digital asset management

I'm working in a company that currently develops Media Asset Management system and now we want to improve our system for document files. I have to search nearly thousand .doc and .pdf files and index ...
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3k views

Schema for an RBAC (Role-based Access Control System)

I want to implement an RBAC, Flat based. I've decided to base my system on the NIST standardization model. Although all fine and well, I have an inclusion to that design. Instead of a hierarchy ...
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657 views

How do I auto-fill data in Microsoft Access 2003?

I am creating a Purchase Order Form at work using Microsoft Access 2003 so that it can be saved and archived in a database and reduce paper costs. These are my current dilemmas: I am unable to ...
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28 views

Anchoring values for a rating or likert scale

I am designing a schema for an interview system as per the suggestion in this answer. I need to store several different types of questions: Questions with a free-text response Multiple choice text-...
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10 views

does insert “logs or traces” into RDBMS (example log4j) makes sense? What are pros and cons?

Our developers are inserting Java logs into a table. This table can grow very much (for example debug logging enabled) and I need to to truncate table. Our database is for OLTP. > desc ...
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52 views

How does one map nested multi valued attributes?

Let's say one has an Entity E. E has a multivalue Attribute M1 and a simple attribute A1. However M1 consists again of a multivalue Attribute M2 and a simple Attribute A2. How would one map this ...
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33 views

Storing Business Logic in Tables rather than Stored Procedure or Application

The requirement is that once the product has been delivered, user can update the logic as he wants. An example of logic I have is follows- An institute teaches English has following requirements - ...
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36 views

What is the difference between (Superclass/Subclass) Total and Partial Specialization?

What is the difference between total and partial specialization of superclass/subclass (or supertype-subtype) structures in enhanced entity-relationship modeling?
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19 views

Database Designs Alternative to Polymorphism in Establishing Relationships

I'm working on a database which handles replacement of parts in a machine. Rules A machine has many components A machine has a set of assembly instructions Many components have many part (screws, ...
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28 views

pub/sub database schema

I am having a hard time creating a pub/sub database schema with stateful metrics. Saying it aloud it sounds easy enough: "There are many organizations that will subscribe to checklists that are ...
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22 views

How to design for scalable set operations?

This is the requirement for an educational application to teach words to language learners: Learner can declare that he/she knows a given word Learner can memorize the given word (to be managed by ...
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30 views

problem with column oriented dbms features

I am currently looking for a free(or at least low cost) column oriented DBMS with really good compression abilities (at least 10:1 ratio) and fast response time. Having evaluated multiple open source ...
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24 views

Database design for different, but related, objects

I'm new to relational databases having enjoyed the flexibility of nosql to date. I want to store data about 'estimates'. An estimate takes a set of parameters that depend on which product it is an ...
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17 views

Time series data and utc conversion

I'm storing data in minute, hour, day, month and year buckets. All data is stored in UTC. Let's assume a client is in PDT time (-07:00 UTC) If the client wants to query for the hour sum of 4/23/2016 ...
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43 views

Ternary relationship with history tracking

I have the following entities Procedure -> id_procedure , desc_procedure . Status -> id_status , desc_status . Subprocess -> id_subprocess , desc_process . The rules are: 1 ...
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25 views

How to avoid repetition of columns of same type in database

I am building a database that will save entities such as: orders, cart, customers etc. All these tables share some common attributes such as: a date, the user agent that was used to create the new ...
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40 views

How can I partition records vertically across machines?

I recently asked two questions: (1) how to store and connect partial records in two or more machines, with the record halves correctly associated, and (2) how to determine the increase in time/space ...
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31 views

Database schema design for dynamic CRM with inter-account interaction

In a traditional CRM, we have some basic objects such as users, organisations and contacts. The users belong to an organisation's CRM account. A very basic schema might look like this: User ---- id ...
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21 views

Efficient Provision of Multiple Versions of Data

We have a fairly unusual database use case: we have a number of large datasets used for research (the largest being a couple of billion rows). The datasets are used by potentially several hundred ...
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38 views

Handling Strong and Weak entity types in a one-to-one relationship

I am modelling a database for a term project and I have come across something I do not have a definite answer to. Diagram I was supplied with the following Entity-Relationship diagram: ...
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75 views

Postgresql string array vs join for user management schema?

I am creating a database schema for user management in PostgreSQL. As, it supports array, so I am trying with three approaches. Which one is best, querying with joins or getting/setting role data ...
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43 views

Database table(s) to record investor activity

I've never asked a question here before. I am currently designing my first database by learning from the web and some books I got, using MS Access to start. I work in operations for a small hedge ...
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83 views

How to structure Many to Many relationship

I have a customers tables, the customer can be either a company or individual. If the customer is a company, then it has specific structure, that means that each company has a (Director , secretary, ...
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66 views

Database design in MySQL workbench

After doing some change As Mr Vérace told me here in this question, by changing the id names of each table into table_name_id and using the singular notation, I still need your opinion about this ...
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39 views

ER Diagram - Choose One or Both of the Entities

So I am attempting to create an ER Digram for a certain catering service. Two of the entities are "Lunch Menu" and "Dinner Menu". Each catering reservation (entity) must contain either one of the two, ...
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21 views

Help needed designing a 'Group' concept for students in a class

I've been wracking my brain for a while now trying to figure out how to fit this part of my domain model into the database, but whatever I come up with just feels wrong. I've attached a picture below ...
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75 views

Storing and searching user location using latest MySQL 5.7 spatial features

I want to use MySQL spatial features to store user location. I have read about MySQL spatial geometry data type. According to this article this works very well in MySQL 5.7 http://mysqlserverteam.com/...
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69 views

Creating relations using tags

I have three tables: Product, Accessory and m:n relation between Product and Accessory. There are currently around 200 products and around 600 accessories. The user wants to have tags on the ...
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20 views

Question on comparing two fields in Access

I'm not sure if the title is fitting as I am not 100% sure if what I am doing is correct but here goes. Here is my enrolment table, I have added a field called pass/fail as you can see which is ...
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169 views

What is a good database design approach for my Online Quiz Android Application?

I have been working on an Android Online Quiz Application with PHP & MySQL. I know what attributes i need however when designing the relationship it becomes complex and confusing when I analysed ...
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28 views

Design improvement on multiple references

Im having some 'perception' problem, maybe... I got this table linked multiple times with another small table and maybe is more of a personal problem with the way it looks but I feel there might be a ...
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35 views

Multiple columns VS one big-capacity-column?

I have a table like this: // table_A +--------+---------------+------------+ | id | short-text | long-text | +--------+---------------+------------+ int(11) varchar(200) text ...
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53 views

Review the ER diagram of a University

A database includes information pertaining to students, lecturers (scientists) and lectures. We store first names, last names and correspondence addresses for each person. A lecture is ...
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27 views

How to bucketize using Query optimal bucketization algorithm

I am trying to implement query optimal bucketization algorithm (QOB). The input of the algorithm is D=(V,F) where V is the value of the attribute and F is the frequency of occurrence. For EXAMPLE D = ...
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61 views

Database for buses timetables

I have to design a database for buses timetables. Entities: Bus (idBus*) Stop (idStop*,stopDescription) Line (idLine*,lineDescription) Position (lat,lon) Some constraints are ...
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20 views

Is there a design model for tracking processes done to an item?

I am working on designing a database model that involves tracking processes almost like an assembly line. There is only one type of item (lets call it 'unit') that has about 10 different tasks done to ...
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72 views

Alternative to EAV to store data with an unknown structure

For my bachelor thesis I have to build a reseach database which has to meet the requirement of provenance. In the present case it means that among other things I have to store the results of my ...
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36 views

is this normalization correct

is this normalization correct for UNF to 3NF
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32 views

Storage solution for realtime time series analytics

I'm designing a system which allows user to analyze their data over time. It is like a IoT database which stores a lot of information from different devices from the user. I don't think that a normal ...
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0answers
25 views

DATE - Normalization, a multiple ranged query, multiple inserts and multiple update

I have a booking system, airbnb style. TABLES -> prices, house, available_date A house has available days and not available days, but sometimes the days have different prices. A weekend is more ...
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0answers
25 views

Which Azure Storage / Database Technology to make use of for large scale logging

I am looking into making use of Azure hosting services in order to develop a logging service for our company. Azure has a number of storage options available (I have listed links below). However I am ...
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32 views

Relational Model

I would really appreciate if you could check my answer for a relational model question. I just started learning. So please bear with me and please guide me through the right process. Consider the ...