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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Strategy for regularly updating datasets from excel files

I have ~10 excel files which are produced by a third party and updated each night. I've have a script that downloads them to my local machine. They contain ~ 10 fields (all short text / dates) and ...
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30 views

Advantage of exposing data model to customers using our product

We have a product through which we provide a standard definition to customer's asset data. The problem currently lies in importing customer's data from different types of data sources to our data ...
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Structure database(s) dealing with different time points

I have few data sets that give a score for a specific account at a specific point in time. So, account A might have a different score each quarter going back 5 years so. There aren't a ton of data ...
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3answers
1k views

Are there any tools to go from ERD to DB design and vice versa? [closed]

I'm learning DB design and looking for some tools, preferably open source software, that could help go from an ERD to a DATABASE and vice versa. For the record, the database i'm using is MySQL.
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112 views

How to model when you could have many (thousands of) attributes to a table (product)?

We have a main table, let's say, Product. It has several general attributes like 'Product Name', Manufacturer ID, etc. As of now, all these attributes are implemented in the data model as columns to ...
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168 views

Duplicate Relationships in Rails/MySQL Healthcare Application

Overview of the Application I am building a Ruby on Rails application to organize medications, using MySQL. The goal of this application is to provide dosage specific treatment recommendations, and ...
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32 views

Which method would be more secure and feasible in the long term?

The concern here is a confusion between two alternative methods for storing data. Our product migrates records from any service A to any service B. These services define their own records and the ...
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1answer
25 views

What should we do when same column fields occurring multiple time in many tables?

I have more than 20 tables in my database. There are some columns which occur in almost all of the tables. In that case what should I do? Do I put all those columns in every table or is there a better ...
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3answers
131 views

Text Storage and Database Design Optimization in a SQL Server Database

Given a database with a number of columns (c), where some of these columns contain text that is one of multiple values due to a set CONSTRAINT on the columns, what is the most efficient way to ...
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22 views

Users' physical characteristics - design

I have to build a database for an employment agency. For each user will be stored physical characteristics like height, weight, hair color...(9 fields in total). I thought I could just build a ...
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25 views

Can I populate a table in mysql without ending up with duplicated entries [migrated]

I have a database. However whenever I am trying to add products to the cart table from a shopping page, I realize that the same item is added multiple times to the table if the add button for that ...
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5answers
3k views

Best way to store units in database

I have inherited a large (SQLServer) database with hundreds of columns that represent amounts of one thing or another. The units for these values (e.g. "gallons", "inches", etc) are stored in the ...
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2answers
34 views

Does an empty entity make any sense in an entity-relationship diagram?

I have an entity that has nothing else than a surrogate key as a primary key. I use it as an element made of a group of other elements For example : TABLE SchoolClass (classNumber INTEGER ...
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1answer
167 views

Handling a chat room in a database

I have been searching all day to find a better answer to my question but those I found was useful but do not critically analyse my question. I am building a chat room using php, mysql, jquery and ...
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1answer
254 views

Database design for a table with both bulk insert and single row insert

I have to design a table where records will be inserted in two ways. Bulk insert from a batch process from a delimited text file between 2 - 3 million rows in a short burst. Later the same records ...
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4answers
7k views

How to represent foreign key in an ER diagram?

Suppose I have a 'Transactions' table which has a column 'Customer ID' (Foreign Key) and a Customer Table having 'ID' (Primary key). How do I show the relation between the two tables and showing that ...
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3answers
52 views

Time sheet, rates, date dependent

I am trying to figure out the best database design for the following; I have individuals (stored in Agents table) that enter their billing or time worked each day for different projects. Now we have ...
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2answers
41 views

Schema review for system to advertise cars

Ok, so I am carrying out a rather simple task as part of a job requiretement. Here is the task in a nutshell: Design a form for creating ad for selling car Form has 2 have: 2 drop downs: Car make ...
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1answer
46 views

Does my ERD look well designed?

I am making a database at no cost for a local dance school. I'm still very new this would like to be sure that I designed it appropriately. From the front end, the parent will: fill out their ...
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405 views

Storing and querying rolling data in PostgreSQL

I have a large quantity of weather model data being put into a PostgreSQL database. The machine has 8 cores and 16 GB of RAM. I'm running PostgreSQL 9.3 with PostGIS 2.1. Each table will have a ...
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1answer
230 views

facebook group alike database scheme

Here are my requirements: one user can have many tasks one group can have many task one group can have many users only invited user by a user can be added into a group Does this db design appear ...
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2answers
169 views

Daily snapshot fact table

I have a list of products per costumer. Costumers can delete or add products to their list. I want to know in each day what is the list of products (and count) by costumer. My first approach is to ...
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1answer
34 views

Do data types go into a Relational Data Model (RDM)?

I have recently been asked to draw a Relational Data Model for a flight information database. I came up with the design in the picture below, but I was told that the drawing is not correct because ...
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44 views

Decompose table into third normal form

Tables X and Y are given as below : X (A, B, D, E, F, G, H, J) with A and B as primary key Y (K, L, M, N, O, P, Q, R) with K and L as primary key Now we need to decompose these tables into tables ...
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3answers
100 views

What is the term for a “wide”, non-normalized view/query?

A well-designed relational DB schema tends to have a relatively large count of relatively small, normalized tables — a cluster of snowflakes, I think, describes the situation. In order to ...
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40 views

Opinion on Database Design for Task [closed]

Would like to know if this is a good database design. Once you see the picture it is pretty much self explanatory. But anyways I will keep it brief. Basically users signup to create a bet, users ...
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1answer
25 views

How to segment account info and profile info?

I am putting a rough SQL database design together and have gotten stuck on how to segment information about the users. (Note before I get into anything, stored passwords are salted and hashed, I just ...
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4answers
89 views

Running Total: To store or compute

Say I have a product table with the following columns: product -------- product_id name And I have another table to record the transaction (IN/OUT) for each product product_transaction ...
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2answers
36 views

Database design for multiple user attributes

I am building an app with Laravel, and I have users which also have a profile. I am unsure about the best way to set up the database for the user attributes. For example: user_ud | name | ...
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1answer
39 views

create table from another table

I have master categories table like this category_id category_name parent_name parent_id 1 animals & pet supplies null 0 2 ...
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2answers
120 views

Idea for manking tables for a pharmacy

OK I'm not into Database management, but I got this problem, also not sure if I'm posting it at the right place or not. So, my Dad works in a pharmacy and all the work there is on paper and is done ...
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1answer
30 views

design database with 2 simillar tables

I have a database which has product_sell and product_buy tables, these two tables are different in a few fields and each one has own comment table product_sell >---< product_sell_cmt ...
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1answer
24 views

Is this a good structure for a table?

Each user/person could know one or more languages. All I can think is a table like +----------+------+-----+------------+-----+-----+-----+-------+ | PersonID | Java | PHP | Javascript | C++ | C | ...
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1answer
163 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, ...
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21 views

best way to store tags

I'm a university student building a web application for a project with three collegues , I took the database portion. Our site is basically a link sharing site and supports tags, what is an efficient ...
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1answer
64 views

Enhanced ER Model Supertype / Subtype modeling issue with inheritance and recursion

Before posting, I have looked for a good solution on internet and I have coined this post for 3 days in row and trying to think through it prior this post. So if I have missed something or got it ...
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1answer
431 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 ...
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1answer
55 views

Should I create a Factless Fact Table or Denormalise my table

I am creating a data warehouse from a store database and I have a question regarding the design of my dimensions and facts. In the store database a table exists for Person, Person_Address and ...
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3answers
36 views

Unknown database file format .DAT

I am trying to find out the database name of this file. I opened it via hex editor: http://gyazo.com/5b579bd2ef9620aa833bf0743a480230 Any help is appreciated. Client sent me this file. It is very ...
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0answers
24 views

Best practices to segment people and attributes for advertising database

we have a database where we store people some attributes per person in the following tables: people (id, name, email, phone) people_attributes (id, person_id, attribute_name, attribute_value) ...
2
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1answer
230 views

Building a branched versioning model for relational databases

I am database designer and at my current project I'm implementing versioning capabilities required to concurrently edit rows of data in RDBMS. The project requirements says, that data editing sessions ...
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0answers
15 views

Nicely managed lookup tables [migrated]

We have a people table, each person has a gender defined by a gender_id to a genders table, | people | |-----------| | id | | name | | gender_id | | genders | |---------| | id | ...
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1answer
45 views

Which terms are used to refer a row in database?

I am creating a Java application, in which I want to create a class that will relate to a row in database. I decided to use Entity while naming the class with a prefix/suffix. But, This page says: ...
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1answer
153 views

Need Advice on Normalizing Database

I have a group of database tables that lack normalization. They all have a similar primary key called 'doc_index', which is either a PK by itself or part a composite PK. As you can see below, there ...
3
votes
1answer
156 views

Enforcing constraints “two tables away”

I ran into some trouble modeling an electrical schematic in SQL. The structure I'd like to capture is part ←────────── pin ↑ ↑ part_inst ←───── pin_inst where "inst" is short ...
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1answer
121 views

Pros and cons of using many schemas in PostgreSQL as opposed to just one?

For a large SAAS application (backed by PostgreSql 9.4), with over 300,000 accounts (and growing), what are the pros and cons of using a schema per account to partition the data vs putting all the ...
0
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1answer
42 views

Uber-wide tables: Time to switch to Mongo?

As a web developer, I've typically only worked with nice, normalized tables in SQL-based RDBMS, but I'm doing some data consolidation for a researcher who will be analyzing correlations between all ...
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2answers
51 views

Databases Fundamentals [closed]

I have tried to learn about SQl Server databases but most tutorials are general or SQL-focused. I'd like to have a solid understanding of the fundamentals of databases so I can build successful web ...
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2answers
26 views

How to build a table for a private messaging system that supports replies?

I'm writing a private messaging web application in PHP, the application allows replies such that when you view a message, you also get to see to what was that a reply to, and to what was that a reply ...
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1answer
21 views

Which table(s) design option is better for users and clients? [closed]

Is it better to have CLIENT (an individual who purchased something) and USER (an individual with a login account) as: 1. single CLIENT table; 2. separate CLIENT and USER tables. Thank you for your ...