0
votes
0answers
40 views

Database Design for NoSQL Fantasy Baseball League

I am trying to create a proper schema to place scraped data into, using a MongoDB database. Currently it looks like Team { id : id, name : String, teamLink : String, username : ...
0
votes
0answers
26 views

Need help with data model

Schema does not list all fields, but only the relevant ones User adds credits/funds to his account using paypal or Internet Banking (which has to be verified manually, and approved, so the 'status' ...
0
votes
1answer
44 views

understanding (and modelling) grocery shopping lists

I am having a hard time understanding how multiple product orders are mapped out. What is the best way of modelling a shopping list for multiple customers? I am developing an C# application that ...
0
votes
1answer
42 views

How can I Automate MongoDB schema design from existing MySQL Database and Logs?

I am working on the project which will automatically generate sample MongoDB schema analyzing existing MySQL database and logs. I am looking for help regarding the below questions. Please, share your ...
1
vote
1answer
41 views

Is there any way MySQL can list relationship cardinality between two entities?

I am working on the project where I have to analyse the MySQL schema. As a part of schema information, I want to list down relationship cardinality between different relations. Does MySQL stores ...
0
votes
1answer
44 views

MySQL DB structure with Main category and several nested sub categories

I am looking to create a set of fields on my webpage identical to what eBay uses on their category selection page when you are selling something. For my purposes I am doing motorcycles, power sports, ...
0
votes
1answer
57 views

Help With MySQL Computed Columns/Auto Updating Field Based On Average

I am currently building a social network type application on-top of MySQL and have run into a problem I can't wrap my head around. In my web application each user has a field called "weight" and this ...
0
votes
0answers
30 views

Unique database presentation ideas

I have completed the first phase of a fairly large database schema design. I built the ER-diagram in DIA. I have to present the schema to an audience of fellow software engineers. Any thoughts on ...
3
votes
1answer
61 views

Help with “Flexible” vs Fixed Tables

We are designing a database in SQL Server to handle sales commissions. A diagram of the current schema looks like this: There are only a couple of us on the project, and our boss dropped this ...
1
vote
1answer
60 views

Does this medical database look correct?

I'm pretty new to databases and I'm trying to create some schemas. I've been working away at this one for a while, but I can't help feeling that it doesn't look right. Essentially I have the ...
3
votes
2answers
196 views

Is there a well-known name for this “poor man's ref. integrity” schema design pattern?

Is there a name for the following database schema design/pattern? My eventual goal is to find more literature about the subject. Today's cursory net search was too full of generic words to be able pin ...
8
votes
4answers
300 views

eCommerce orders table. Save prices, or use an audit/history table?

Im designing my first eCommerce schema. I've been reading around the subject for a little while, and am a bit confused about the relationship between an order_line_item and a product A product can ...
3
votes
2answers
47 views

Best design for a many:many relationship issue

We have three types of entity, each with their own table: table:A(a_id), table:B(b_id), table:C(c_id) Each of these entities can have any number of email addresses and linked Twitter accounts. ...
0
votes
1answer
74 views

Relation between multiple hierarchical taxonomies linked to a single entity

I am working on an online test application which supports multiple choice questions. I have created schema for taxonomy (classification) system to be used with questions. taxonomy(id, name, slug, ...
1
vote
1answer
76 views

Should I save “document ID” as a String or Number in MongoDB

So I'm importing about a 100,000 documents into mondoDB. MongoDB already generates an Object hash but the data has a documentID that was used to identify records in the previous database. The IDs ...
1
vote
0answers
38 views

Schema for yearly data models

I am developing a school management system. Most data will not be reused after the end of the school year. I am contemplating using schemas to separate data in various school years, however I am ...
2
votes
3answers
127 views

Database design for bookmark system

I am creating a bookmark system where people can save their bookmarks. Each user has its own personal page with bookmarks. A bookmark should have atleast one tag and max five. Each user can create ...
4
votes
2answers
159 views

Is it bad idea to create foreign keys on the tables in a different schemas in the same database for big applications?

I am working on the transfer a big pl/sql web-based application to the dedicated server. This application is located in one schema with 70 packages of programm code. This application was made ...
0
votes
2answers
46 views

Store extra, optional information about any entity [closed]

I've done a bit of reading but haven't found anything related. This must be widely discussed, so it's most likely my fault. I've got a relational database with a number of different tables, each ...
1
vote
1answer
83 views

Polymorphic Association - is it bad? [duplicate]

In the following schema: Collections Upvotes Reports Upvotes Reviews Upvotes I'm tempted to have a single Upvotes table with a single "entityId" column that stores either the ...
2
votes
1answer
98 views

To normalize or not to normalizde? (10 fields)

I'm helping someone to design a database and for a specific case I'm not sure. I have 10 fields - this will never change - that will always be filled and used in every query that could be coming up. ...
2
votes
3answers
229 views

Many to many link tables with history? [closed]

While creating a PostgreSQL database of customer subscribed services with DNS domains, I want to: enable customers to subscribe to multiple services each service can have multiple domain names per ...
-2
votes
1answer
93 views

message table schema - body TEXT or varchar [closed]

I want to make a small social network. For messaging body which one is more suitable? VARCHAR or TEXT? if VARCHAR how long is efficient?
0
votes
1answer
77 views

How to reduce table duplication, while ensuring integrity of the database?

For example, in my app I have some class called Contact: case class Contact(name: String, email: String, phone: String) And several other classes have one-to-many relation to that contact (for ...
1
vote
2answers
153 views

How can I integrate a new system to a design scheme I previously created?

This is a follow-up to a question I wrote a while ago, for reference, you can look it up here. I've developed a curriculum based database scheme that looks like this(Thanks Joel Brown) Now that a ...
2
votes
1answer
69 views

Constrains relationship

I have the following design. Each user has it's own contacts, it's own hosts and assign those to a domain which belongs only to him. I want to insure that the host you assign to the domain belongs ...
0
votes
2answers
189 views

Which schema is better for a shopping project? [closed]

I'm working on a business-to-customer project that has variety of product types. There are a few properties like name, description, brand_id that each product has but there are also many specialized ...
1
vote
0answers
99 views

Are duplicates ever acceptable in a database

A warehouse system I am working on allows inwards consignments [type = 0] and outwards consignments [type = 1]. The user selects multiple products for each consignment and then multiple warehouse ...
0
votes
1answer
81 views

Whether or not to create separate tables

I am working on a project, where I need to store the information related to A and B, the A and B both have identical columns.There might be thousands of As and Bs. Should I use "type" column to ...
2
votes
1answer
53 views

How to handle “or” possibilities in MongoDB

I'm new to MongoDB and by no means an expert in DB design in general. This feels like a really basic question that's probably been answered a million times, but I'm having a surprisingly hard time ...
-4
votes
4answers
128 views

Is there a DB that will allow the same field name with different cases?

Is there a DB that will allow a user to create a table with two fields, one calls MYFIELD, the other called myfield?
2
votes
1answer
84 views

MySQL Performance Gains By Splitting Tables?

I am designing a database schema to be used with MySQL. The database needs to keep track of a users basket items and purchased items. I've thought about two ways I could do this but not sure which ...
1
vote
0answers
414 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 ...
2
votes
3answers
162 views

Database design for conditional detail table

I have an expense management system for monthly expenses. Expenses are of two types: one-time monthly expenses, and daily expenses for each day of month. I have created the following tables: ...
6
votes
4answers
487 views

How can a database be normalized when an optional field causes denormalization?

Suppose you have a warehouse full of widgets. Each widget in the warehouse is stored in a specific identifiable location within the warehouse. You might have a schema which looks like this: A ...
0
votes
1answer
77 views

When is it worth it to use Triggers and stored procedures/functions? [closed]

As an example, lets say I have a forum application and for every topic that is created, I have a trigger that fires a database function creating a post.(lets assume we have a topics table and a post ...
1
vote
1answer
134 views

What is the meaning of this anomaly warning message?

I have run an analysis with SchemaSpy. The tool gave me a warning message for two tables. The warning message is: Tables with incrementing column names, potentially indicating denormalization ...
5
votes
1answer
101 views

Many:Many with Shared Relation

I'm modelling data with multiplicity like this: Each Composition/Anthology related pair must share a Composer. Also, each Anthology must contain at least one Composition. How would you recommend I ...
1
vote
1answer
1k views

Oracle database created whats next? Create Schema or Create Tablespace?

I'm a programmer that's being thrown to the DBA/Sysadmin island all by myself with a volleyball that I named Wilson. I'm trying to survive here. I'm supposed to create a database for an application. ...
0
votes
0answers
67 views

In regards to GS1 barcode - what size DB field are used?

In regards to GS1 barcode - what size DB field is used or is the entire GS1 typically not stored in database, but rather processed in the application layer and stored in the database as a collection ...
0
votes
1answer
197 views

Database schema design help needed

I am developing a PHP application expecting millions of records both parent and children. My goal is to design an optimized database design to achieve high speed and performance. This application ...
1
vote
0answers
341 views

How to represent class table inheritance (current DBMS-specific way please)?

I want to implement class either-or table inheritance (Account, CatAccountDetails, DogAccountDetails) in SQL Server. I found a recommendation for MySQL here (How do I map an IS-A relationship into a ...
4
votes
1answer
414 views

Will table inheritance in PostgreSql suit this situation?

Let's start off by saying, I'm new to PSQL and coming from a MSSQL background. I'm starting to design a DB in PSQL. So my main aim is to have a Main schema in this DB, which I am going to use to ...
1
vote
2answers
157 views

Extensible Asset Database Schema

Background I work for a decent sized company in the hardware sector. Currently, we have a number of varying assets that need to be tracked. Until recently, this was done by hand as was an ...
7
votes
4answers
460 views

Database Design - different objects with shared tagging

My background is more in web programming rather than database administration, so please correct me if I'm using the wrong terminology here. I'm trying to figure out the best way to design the ...
2
votes
2answers
195 views

How to design future proof tables?

I am new to database design and have started developing my first schema. Some of my tables (e.g. user_profile) I am struggling to come up with an exhaustive list of fields for the table. A particular ...
7
votes
1answer
201 views

Designing Simple Schema for Disaggregation of Demand Forecast

I am doing a simple database design task as a training exercise where I have to come up with a basic schema design for the following case: I have a parent-child hierarchy of products (example, Raw ...
5
votes
2answers
102 views

Relationship that are optionally more specific

Forgive my title, I couldn't think of anything that accurately describes what I'm talking about. I currently have the following relationship. CREATE TABLE Events ( ID INT IDENTITY(1,1) NOT ...
0
votes
2answers
71 views

What to have in the main table and what to have in meta_table?

I'm try to figure out the best scheme for the users table for my software. I'm trying to separate the main data and auxiliary data into 2 table called users and user_meta for the sake of extensibility ...
0
votes
2answers
954 views

Billing Module (Fee) for School Management System

I am working on a School Management software which includes module for billing of students i.e, fee collection from students. The fee is collected on monthly basis (12 times a year) and the total ...