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.

learn more… | top users | synonyms (4)

0
votes
0answers
72 views

How should I restructure a table that contains multiple columns that contain similar, but not same data?

I currently inherited an InnoDB table that describes a product. In the table there are a few columns that describe the maximum height at which the product may be mounted. These are the columns: ...
0
votes
0answers
258 views

Normalizing data to 3NF

I need some help with normalization. Here is the data in 0NF : **HOSPITAL SERVICES (date_hospitalization , id_patient , id_doctor , name , surname , PIN, duration_of_hospitalization , ...
0
votes
2answers
6k views

MySQL count multiple columns and sum the total occurrence

I have the following table, say, MyDRAW ... DRAWNO PRIZENO FIRSTD SECONDD THIRDD FOURTHD M123/14 8458 8 4 5 8 M123/14 7214 7 2 1 4 M123/14 1640 1 6 4 0 ...
0
votes
0answers
60 views

Same table for real persons and fictional one

In my application stores both real and fictional persons (from movies, etc.) as well as stage names and alter egos. These entities have almost the same properties and are often referenced via foreign ...
0
votes
0answers
19 views

Junction table for peer entities and uniqueness for a link [duplicate]

In my database I have two tables: for peer entities (e.g. Persons) and for links between them (e.g. Friendship). Obviously, the latter table contains at least two references to the former table (e.g. ...
0
votes
1answer
71 views

Simple yet multilingual flashcards - proper database design

I'm making a simple flashcards app for personal use. I've thought about having such table: CREATE TABLE flashcards ( translation VARCHAR(50), entry VARCHAR(50), lang ...
0
votes
0answers
108 views

Best practices for ranking records in flexible way

Suppose we have 10000 records of any product. User search on our website with his given criteria. so we output search results based on given criteria. Now Admin want to rank products in search. so ...
0
votes
0answers
60 views

Advice on DB Changes

Requirement: I'm required to prefix a couple of strings to the existing one. I.e. The current way, the Accounts been recorded in AccountID field looks as "621230093VN00" Under the new format ...
0
votes
0answers
96 views

Inserting and updating on same table

I am currently working on a database that aims to provide information regarding the amount of time people stay in a company's car-park premises. This is done using a table called "tbl_stay" which has ...
0
votes
0answers
39 views

Have a lot of customers -> which design in SQL Server 2008R2 should be chosen [closed]

I have a task and I don't know how solve it :) So, we have a lot of customers who should use SQL Server for their applications. Design is standard and simply: Customer -> Remote Desktop -> ...
0
votes
0answers
147 views

Datamodel design for multiple roles, country access

I am in the process of creating a data model for the below scenario there will be two hierarchies a) dept hierarchy (emp -> team -> dept -> branch) b) sales hierarchy (emp -> marketing manager -> ...
0
votes
0answers
2k views

Database design to track inventory?

Would this be a good starting point for tracking inventory with several warehouses? If yes what is the best approach to sum quantity when displaying stock by warehouse/type/general? mysql structure ...
0
votes
1answer
83 views

is-a relation(ERM) to tables

i try to design a database with an is-a relation: Vehicles have some general attributes and the SubVehiclesX have some specialized Attributes. SubvehicleX is a Vehicle And a Person has a Vehicle ...
0
votes
1answer
120 views

Nullable One To Many w/Join Table - Indexing

I have a question regarding database design, I am working with PostgreSQL using Hibernate for ORM, the design I inherited includes the following tables users user_id (pk) user_name user_dob ... ...
0
votes
1answer
811 views

Advantages of middle tables in one-to-many relationships

Entities: Lists Leads What I am trying to achieve is a scenerio where in the relationship between lists and leads the following constraint is applied: A list can have many leads, but a lead can ...
0
votes
1answer
60 views

Constraint referencing multiple tables [duplicate]

I believe my problem is something similar to this but I am not really sure. I am not even sure my title is on topic. Using mysql. I have the following ACL design for a website: ### tools id name ### ...
0
votes
1answer
149 views

How to store a Preferred Contact? [duplicate]

I'm creating a CRM type application for a client. They need to store information about Companies and information about Contacts within those companies. Each Company can have multiple Contacts ...
0
votes
0answers
80 views

Database design: Modifying an open source database without a lot of changes

I am adding more functionality/features to an open source project. The project is about a forum where each post can be given a specific list of tags. The tags are homogeneous. I.e they are of similar ...
0
votes
0answers
3k views

Multi user messaging database design

I'm designing a database for a new project and I'm looking for some feedback on the design before I start to implement. It basically consists of secure messaging system with those abilities : One ...
0
votes
1answer
84 views

Multiple values for unique id? [closed]

I have two tables: customer and boxes in one-to-many relationship. The structure of the tables is in addition : Customer table : id#| name | date_purchased | address | 1 John ...
0
votes
0answers
199 views

Import only selected column from tsv into mongodb

Edit I am uploading very big tsv file thats why i dont want to import unnecessary column in mongodb, I know how to upload file into mongodb(just as attachment) as:- mongoimport --db xyztsv--c ...
0
votes
0answers
23 views

Joining data from 2 different servers

It is possible to host my databases on 2 different servers? For example if I store my comments on 'heroku' and store users on some other server it is possible to join the two servers together?
0
votes
1answer
175 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 ...
0
votes
1answer
112 views

Database Structure and Design [closed]

Okay my project in simple words. Multiple shop sites are hosted on different hosting services receiving orders from customers. All the orders are to be directed to the main company website where the ...
0
votes
1answer
71 views

Modeling a database for easy counting / reporting

I have an app where user is known (user_id) and he can do several actions (action_id). Every time he makes an action I need to save the fact that he made it for reports/analytics. I guess it is ...
0
votes
0answers
521 views

Trouble converting MySql Database to SQL Server

I have an mysql database that contains 38 tables. I used "SQL Server Migration Assistant for Mysql" tool to convert this database to SQL server Database. I successfully converted 37 tables. Only one ...
0
votes
2answers
65 views

This certain MySQL database organisation

Hypothetically, let's say that I have three tables: - Products (id, product_name, added_timestamp) - Individuals (id, name, last_name) - Companies (id, company_name, company_number, company_address) ...
0
votes
0answers
81 views

How can I model this problem in a graph database?

I have a project that I'm working on where I extract data from PDFs and map/visualize the relationships between the extracted pieces. Here's an example of my problem: file: 11425646.pdf author: ...
0
votes
1answer
268 views

What's the practice to generate long user id like those on Facebook?

Now I am about to launch a site and I have trouble coming up with a way to create long user id(e.g. 4000002). Do I set id to auto-increment(Starts at 0) and then add something(e.g. 4000000) to this ...
0
votes
0answers
173 views

How implement MySQL unique index with two foreign key that one can be null?

I would know if can be declared in MySQl to create an index constraints in a table with two foreign key that one can be null. For example cannot be repeated a null foreign key with the other foreign ...
0
votes
1answer
50 views

Table Design for user-specific and user-agnostic criteria

I want to design a table that is general enough to accommodate an increasing number of achievements as I come up with new accomplishments to reward. Initially, I thought to design the table as ...
0
votes
1answer
104 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 ...
0
votes
1answer
44 views

How to link several tables?

I'm a newbie at Database Designing. What I want to do is perform several actions at once. I have a main users table which holds all the data for a user at a website. Then I have a primary key as the ...
0
votes
0answers
596 views

InnoDB errors after having deleted “ibdata1”

By accident, I have deleted the ibdata1 file in the MySQL directory because MySQL wasn't functioning correctly. After reading so many forums, I found a post that recommended deleting the 3 files ...
0
votes
0answers
679 views

Postgresql Retrieve / Find Primary Key Serial Autonumber field for Audit logs

I need to find the Primary Key field name in each of a number (approx 70) of tables to create audit logs. All the primary keys are type serial (auto incrementing integer) and all have the name in the ...
0
votes
1answer
802 views

Defining system scope and boundary

I have been given a homework task where I am to create an ER model of a database from a set of client requirements. Another part of this task is to create a diagram that shows the scope and boundary ...
0
votes
0answers
9 views

speed up data transfer from SQL server to application [duplicate]

I have build an application that handles data stored in a MS SQL server database. This server is hosted externally of our company and has to be connected to via SSH because of company rules. On a ...
0
votes
1answer
116 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
0answers
120 views

Database Schema/Structure advice

Well i am reconstructing an already created application and was looking to improve this, especially with in the database structure. I want to start off with probably the biggest section and that is ...
0
votes
0answers
186 views

Ternary Relations three attributes and an association

I have 4 tables: Workers Work Workers Relationship/Work Registration Time I need to have organized the Workers Relationship with Work so you can make a ListBox organized. Where each worker may ...
0
votes
3answers
529 views

Rent weekly cost database design

I have a database which contains a table BUILDING with in each row details about some building, another table BUILDING_UNIT contains rows with details about a single building unit which refers with a ...
0
votes
0answers
139 views

UML class diagramm for database design?

I used to make database designs using a french method called MERIS that uses mainly two diagrams to create the database (MCD and MLD), then i heard about UML and that is used also for databases and ...
0
votes
0answers
402 views

Error in creating trigger in phpMyAdmin

I have 4 tables: event: event_id(p.k) | uid | circle_id(f.k) activity: uid | performed_activity_id(f.k->event_id) | activity_type_id follow: follower_id | circle_id(f.k) notification: sender_id ...
0
votes
1answer
176 views

Database suitable for data mining

What would be an appropriate / suitable database sans Oracle that would be suitable for the following conditions? data mining includes but does not limit to the following: a. clicking on links b. ...
0
votes
1answer
2k views

What is the difference between int(8) and int(5) in mysql? [duplicate]

I found out, that if you have a field defined as INT(8) without ZEROFILL it will behave exactly as INT(5) in both cases the maximum value is −2,147,483,648 to 2,147,483,647, from −(2^31) to 2^31 − 1 ...
0
votes
0answers
54 views

How to properly design this type of relationship [duplicate]

I am building a model with the following requirements: Items may have attributes Attributes may be of type: 'Choice', 'FreeText', 'Number' I am not quite sure how to relate the item to attribute ...
0
votes
1answer
94 views

Setup logical Database model for measurements

I'm struggling to set up a logical model for the following spreadsheet: (See a close-up of the table here.) My problem is that it is not clear to me how to deal with the "gap" values where each ...
0
votes
1answer
279 views

Patients profiles database

I am making software for patients in hospitals. I want to make an option that if a doctor has prescribed a drug that interacts with another drug that the patient already uses, a warning will appear ...
0
votes
0answers
61 views

When is should/shouldn't the Entity Attribute Value (EAV) pattern be used? [duplicate]

Possible Duplicate: Is there a name for this database structure? The Entity Attribute Value (EAV) pattern usually has three columns: foreign key, attribute, and value. Attributes of data ...
0
votes
0answers
305 views

Schema for Google Docs-like sharing

Am trying to design a nicely normalized schema for sharing entities in a database, with good referential integrity. It should work similarly to Google Docs sharing. Here is what I have so far: ...