Database design is the process of specifying the logical and/or physical parts of a database. The goal of database design is to make a representation of some "universe of discourse" - the types of facts, business rules and other requirements that the database is intended to model.

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Should I create a extra relation-table when I have two columns in one table referencing to one column in another table

My problem is best explained by example: Suppose I have a database about chess games and players. Which one of the following structures should I choose Option 1) player (player_id,name... etc) ...
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36 views

DB Design for Mobile App Clients

Hello I am new to designing DB for Mobile App where speed is the Key. My Mobile App will request to WebAPI and WebAPI will get data from MySQL. I have designed my tables in MySQL as per relational ...
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2answers
42 views

Should a table have a foreign key to another table if it already has a foreign key to another table that has that foreign key?

That was a hard title to digest even for me so I'll break it down. I'm very new to SQL, and I just designed my first database. I also am not very good at JOINS which might be the answer to my ...
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49 views

Creating many-to-many relation on demand?

Users can join projects. Projects can have many tasks. Each user completes the task at their own time, they can also have some other user specific settings on the task like the priority in their ...
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35 views

Is this a good way to model course assignments?

I'm having trouble designing a data model that allows for the following: Courses can have many assignments. Assignments can be defined recursively. e.g. "There is reading homework every tuesday". ...
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46 views

Entity ID field that can refer to multiple tables?

In designing both audit tables and notification tables, I've run into an issue where I need a row to refer to an entity in another table, but which table that entity is isn't always the same. For ...
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1answer
45 views

Creating a flexible table containing prices and periodes

I'm creating a system of availability for rooms and with a calendar according to the days, with every day have it's own price. Room Type | 01 | 02 | 03 | 04 | 05 | ... | 31 | ...
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25 views

table design approach for a rental application with several one to many relationships

I'm trying to go about designing a database/tables for the following situation I'm being presented. I'm developing a rental web application with MySQL as db engine. It is for a nonprofit organizations ...
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3answers
76 views

designing a database with type and sub type

I am trying to build a publications database, and i want to develop a genre relation that has various (maybe look up tables) sub-genres attached. as an example, in the genre relation there would be a ...
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59 views

How to store a version sequence per product

I need to create a table like the following one: +----+---------+---------+ | Id | Product | Version | +----+---------+---------+ | 1 | 1 | 1 | | 2 | 1 | 2 | | 3 | 2 ...
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12 views

When to use tags vs binary fields in a constituent management system?

I have a table of Constituents and I want to track yes or no qualities like: are they a teacher? are they an elected official? are they philanthropists? There will be less than a dozen of these ...
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44 views

PizzaShop - DB - Normalized Schema

I am trying to make a simple DB in Access for a theoretical pizza shop(the db is for an assignment). What I am trying to do is link one type of pizza to one or more types of toppings. I just wanted a ...
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87 views

Ideas for Database schema for Automotive web app

For the last couple of days I have been searching all over Google for database schema for my automotive web application [like a marketplace of sort] (in Laravel 5 PHP). I have tried many models some ...
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83 views

MySql Innodb Database Slow INSERT Query to Remote Server

I have searched thoroughly on how to improve general performance of my database which is hosted on Hostgator. I have mostly come across performance tuning strategies which are catered to only local or ...
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2answers
171 views

Double entry bookkeeping database design

I'm doing an accounting software and I need to enforce double entry bookkeeping system and I have the classical problem of 1 row per transaction versus 2 rows. Lets take an example and see how it ...
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0answers
39 views

Post categories model for a user submission wedbsite

I'm building an user submission site where users can make posts to content_types: Blog, Movies, Photos, Forums. Since these content types only have slight variances I would like to keep them in one ...
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1answer
27 views

Working on a blog creation website; should I be creating a new table for each blog, or keep everything on the same table?

So I'm working on this blog creation website as a side project. I don't actually expect it to become anything, but I want to make it as efficient as possible, even if just for practice. The idea is ...
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2answers
99 views

Split database to fit on SSDs

I have a database that's about 3TB in size and want to upgrade to SSDs. The SSDs I found that are reasonably priced are only 512GB so I'll need to purchase multiple drives. What are some ways to ...
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3answers
213 views

how to store mp3 files in mysql database by using phpmyadmin?

first of all i am new to database, but i want a database for my site to store mp3 files in it so later i play them on my site by using jplayer. little though i know about database they said there are ...
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21 views

Calculate Num_Index_Pages for sizing design

I don't understand Step2 #8 Calculate the number of number of non-leaf pages in the index. I am not sure I understand the "Level". I have Num_Leaf_Pages=508 & Index_Rows_Per_Page=476 I don't ...
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2answers
66 views

Why is vertical scaling expensive?

As you can find here Best Practices For Horizontal Application Scaling, vertical scaling is much more expensive than horizontal scaling: vertical scaling cost increase exponentially whereas with ...
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0answers
17 views

IBM Data stage compiler error

I have installed InfoSphere Datastage 9.1.2 on Windows Server 2008 R2, and also installed C++, but when I try to compile a job show error in transform stage.
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35 views

Mysql - too many Deletion - Insertion

I'm creating crons for my OLAP sysetm, I have a cron that deletes the records from the summery table first and then insert the records in it again, Say Deleting 1 month records, and ...
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3answers
88 views

Which of these database designs is normalized?

I have two possible database designs. A) a many-to-many relationship between Branches and FiscalYears via a dedicated join table FiscalYearsBranches B) two (or more) many-to-many relationships ...
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25 views

When to include and exclude products from a webshop database? [closed]

I'm working for a company that runs a webshop and integrates around 15-20 different merchants. In the database schema for the actual website/webshop (Rails with postgres SQL), products are only ...
2
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1answer
94 views

How to write a query, with multiple foreign key in mysql

I am working on a simple PHP and MySQL college level clinic management system. There 4 main table which relation with foreign key. I'm little bit confusing multiple foreign key in table .. what would ...
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48 views

Design Payment System - Best way to track different payment types and reasons

I am designing a system to track incoming payments from external entities. Payments will be stored on tblPayment and take place in different ways, to mention some: 1) cash 2) cheque 3) credit ...
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1answer
38 views

Options for structuring multiple associations to a record

This is 101 level stuff and I promise to read a book later, but in the meantime, given the following three tables: Product --------- ProductId (uniqueidentifier) User --------- UserId ...
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1answer
34 views

Database table data with different set of values

I am trying to create a database table for my project but I stuck in this type of data. The purpose is the admin can add, modify or insert types of questions and choices example: Do you like ...
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1answer
57 views

10000 tenants and Muti-Tenant Data Architecture performance?

We are trying to decide on a database design for a new web application. We expect to have close to 10,000 tenants and would like to keep their data in separate databases if it makes sense to do so. ...
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2answers
64 views

Database Design - Cardinality

I am currently studying for my MTA Database Fundamentals cert, and I came across this question during my studies. However, the answer doesn't make any sense to me. Here is the question/answer: It ...
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1answer
78 views

Can I have more than one relationship between two tables? [closed]

I want to make database for report maintenance. I have 3 tables: employees header_maintenance_report detail_maintenance_report employees table I have employee_id and then in the ...
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1answer
46 views

What is the best way to represent an Team and player relationship in ERD

I am working on designing an ER diagram for a football system, i stopped in the relationship between the player and team, as we know the player plays for only one team and team have many players, so ...
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37 views

Career Database Design

I am new in cakephp, I want to develop a simple career website, I have design the database, but I would like to show it to professionals and know if the structure is ok Jobs - id - job_title - ...
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1answer
30 views

DB Recommendation While Minimizing Size

I apologize if this question is too specific, if it is, please let me know! I have searched around both on here and the web on selecting the best project-specific engine to fit your needs, and have ...
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1answer
38 views

Load & traffic balance best practices

I am about to design an enterprise solution for a large scale application in which a windows service, MVC, and many other projects will use a database, so I am thinking about load balancing and best ...
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38 views

What is wrong with my ERD?

I am trying to create a reservation/booking ERD. Is their anything wrong with my current ERD? It must show a supertype and subtype, and it must identify attributes for regular, weak, and associative ...
2
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2answers
38 views

Table design question for a `Check all that apply` survey

I'm looking for advice on a design for a portion of a table. Background We're collecting survey data for multiple sites, and one question is a check all that apply. Currently, there are from 2-5 ...
0
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1answer
23 views

How is time stored in the FireFox sqlite database “places.sqlite”?

How is time stored in the FireFox sqlite database "places.sqlite" ? Looking to modify the stored visit time on a few entries but I can't seem to figure out how to, is it encrypted?
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1answer
62 views

Social file sharing database schema

I have a project called social media file sharing. I have this database schema and I need your opinion about what I should remove or add or edit on my database schema. Every user can upload media ...
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41 views

Find the Minimal Basis

Suppose we have relation R ( A ,B ,C ,D ,E ) , with some set of functional dependencies, and we wish to project those functional dependencies onto relation S(A, B, C). Given the functional ...
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39 views

Promo Codes - should I create a separate table or add a code column to a join table for Students and Courses

I'm creating a promo code and invitation system and I want to understand the best way to structure the database to include the Promo Codes. This is what I have currently: User: has_many Courses ...
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49 views

Is there a way to check which views have data? Oracle 11g

I'm undergoing a cleanup process for a data mart design. However, I want to get rid of any views (in the design) which result in having 1 or less rows of data. Instead of manually going through ...
0
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1answer
52 views

Modeling Optional Foreign Key from Composite Primary Key field (Oracle Data Modeler)

I am trying to add an optional foreign key in Oracle SQL Developer Data Modeler v4.1.0.873(Build 873), as per diagram below: The issue is that I can only make such a relationship if it is mandatory ...
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1answer
75 views

(MySQL) user table and profile separate, or same table?

I'm creating a blogging site that anyone can sign up and be an author for. I want each author to have their own public profile. My main question is; would it be better practice to have a separate ...
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202 views

Facing Failed to read stream error - mysql_native_password error

I have been facing the following error intermittently on MySQL. Authentication to host '127.0.0.1' for user 'root' using method 'mysql_native_password' failed with message: Reading from the ...
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0answers
16 views

App with ETL like operations - pull back small sets or one large set?

The problem Have an application that needs to provide back a result set from a normalized database into a single result sheet that is highly normalized for processing changes in excel. Must be ...
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103 views

Advice designing a stock management database

I am developing a webapp for my business, a mobile phone repair shop. The problem I have is I don't know how exactly to implement a way to manage the parts inventory. Here what i have now: ...
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1answer
42 views

how many tables do i need to create in MYSQL [closed]

can anyone tell me or help me with this please how many tables would i need to create in MYSQL?
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2answers
153 views

No suitable driver found Orientdb jdbc driver

I have some problems with Orientdb driver for jdbc. i´m using Netbeans, i have include the library JDBC+OrientDB libraries (orientdb-jdbc-2.0.8-all.jar) in the directory and in netbeans, i have also ...