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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Column A or Column B required MS Access DB

I'm in the situation where I would like to enforce the requirement where a record must contain either one column or another at a data level, I'm not sure whether it's achievable. I've got an Enquiry ...
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2answers
38 views

Fetch all words from column with like

I have a column with description and inside it can contain # value . what I want is all the words searched from that column with #tag This is my query SELECT description FROM photo where ...
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41 views

DB Design: Looking for Performance improvement with a Column used in all SQL Queries

I recently got added to a new ASP .NET Project(A web application) .There were recent performance issues with the application, and I am in a team with their current task to Optimize some slow running ...
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19 views

SQL query to fetch results for multiple many to many relationship tables

We are developing a database for storing licensedetails of source code, archives, shareobjects, binary. We parse a detailed build and extract list of source files that make objects, list of objects ...
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1answer
20 views

Design for an Asset Management System

I'm attempting to design a database to track IT Fixed Assets and Consumable Parts; what is the best practice for this? Should I design separate tables for Fixed Assets and Consumables, or should I ...
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2answers
161 views

Relational Model vs. Database Products [on hold]

The formal Relational Model (logical level) for databases is not exactly the same thing as you get with MySQL, Oracle or other major products / implementations of ‘relational’ database management ...
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23 views

What's the proper design for the table that will hold the processor load stats?

Let's say that I need to implement a widget on the site that allows the user to view the processor load stats via a chart. The user will be allowed to choose how detailed the statistics are: with ...
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2answers
218 views

Separate table for 'scheduled payments' and 'completed payments'?

In a previous financial payments related database I'd worked on, it just had one large transactions table. We would insert scheduled transactions for the future, and when that time came, we'd execute ...
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20 views

use of crows foot or chens notation to draw an extended ER diagram

I am trying to understand if we can use crows foot or chens notation to get an extended ER diagram. or does extended ER diagram has its own notations that should be used ? From what i understand, ...
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8 views

Design and queries for analysis of event-sequences

I will have to store sequences of events with certain properties in a database (MariaDB preferably) and I have some issues regarding the design and queries. The crucial part is the analysis of the ...
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1answer
43 views

When to use a multidimensional relationship in an ERD?

When to use a multidimensional relationship in an ERD? My textbook is in Dutch, and the two paragraphs that explain about multidimensional relationships is too vague and brief. I don't understand when ...
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2answers
32 views

DB for storing simple time-stamped values

I don't have that much experience in databases but I need to accomplish this as best as I can. It is rather specific. Database will contain only data structured like this: dataID-timestamp-value ...
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1answer
46 views

Suitable database to store GPS track data

I have a network of vehicles. Each vehicle is equipped with a GPS sensor sending data over 3G to my FTP server. As a first solution to test the sensors, each vehicle sensor sends a .csv file to the ...
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1answer
58 views

“Transitive” keys

I have a central table, A, which will have a key that I'll call A_ID. Now, I have a table B in a "one to many" relationship with A (many B's map to one A). Each link will, of course, have a link ...
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36 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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10 views

Architecture for huge catalog of products

I need to upgrade my current system of product catalog. For currently I have a 12 000 items in catalog, it's not a lot, but I need to improve them for feature. I have a task to reorganize my database ...
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16 views

Peer Review of ER Diagram for Flight information

This is the first ER diagram I have made. I am hoping that some of you will have valuable information and criticism about my design.
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1answer
83 views

Execution plan index suggestion - difference between similar queries

I am trying to analyze queries on this table: CREATE TABLE [dbo].[Values]( [tid] [smallint] NOT NULL, [t] [datetime2](3) NOT NULL, [v] [real] NOT NULL, CONSTRAINT [PK_Values_Unique] ...
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1answer
66 views

How to improve this product rental schema?

I have a rental system where each product's stock item can be rented from a location and returned to a different location (think Alamo, Hertz etc.). When saving an order, first an inventory event is ...
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1answer
53 views

MySQL - varchar length and performance

Is declaring VARCHAR size make sense for performance? Is there any difference (in speed) between VARCHAR(50) and VARCHAR(255)? Or defining length is logic/design constraint?
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1answer
104 views

Peer Review of Database Design

I'm working on a movie inventory database. This is a personal side project for me. I can use what I have, but I would like to make it the best design that I can while learning more about databases and ...
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1answer
20 views

Fetch data from database from multiple tables matching condition

I want to fetch data from the database. I have three tables in my database like listing_master_residential and listing_master_condo and listing_master_commercial. There are three tables and there is ...
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0answers
32 views

Completion of ERD, uncertainties about generalization/specialization and primary keys [duplicate]

I'm practicing making conceptual databases and I would like to know of I'm on the right track. I've been trying to create an ERD for a scenario as follows: A hotel can take bookings for weddings, ...
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1answer
24 views

Building dependence between regional data (Street -> City -> PostalCode -> Country)

I'm in the process of designing a database to contain regional data to be used inside a CRM system. So, a user suspects that things like the city or country are automatically filled (or maybe just ...
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3answers
48 views

Completion of ERD, uncertainties about generalization/specialization and primary keys

I'm practicing making conceptual databases and I would like to know of I'm on the right track. I've been trying to create an ERD for a scenario as follows: A hotel can take bookings for weddings, ...
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2answers
34 views

Need database design advise

I attached the DB schema, so it will be simple. Problem: Need to get the item records from the company e.g. 'A'. Should I add to the item table company_id field? Will it be a redundancy info as we ...
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2answers
51 views

Database Design for Preserving Values and Additional columns

My colleague and I are having some trouble coming up with a database design, and I am doing my best to stay away from EAV for now. We have an entity called Preparation that stores configuration data ...
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3answers
45 views

Best way to create relationship between multiple tables

I have a question about how to best handle a table that would be shared among multiple relationships, but shouldn't really be joined with all these tables. For example, suppose I have a table that has ...
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25 views

many to many relationship tables for four or more master tables

We are developing a database for storing licensedetails of source code, archives, shareobjects, binary. We parse a detailed build and extract list of source files that make objects, list of objects ...
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2answers
143 views

Best practice database design - user rating tables

I want to create a table to store user ratings of items for collaborative filtering algorithms. So far my table looks like this: IID | UID | Rating i.e. item ID |user id |rating. From ...
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2answers
83 views

SQL order by query results in any arbitrary (but reproducible) manner

For testing purposes I need to get some data from a set of database tables in any arbitrary (but reproducible) order. The idea being that I can later compare two runs using a textual diff tool. Is ...
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1answer
23 views

Multiple User Types - DB Design Advice

I'm developing a web application that will support user authentication with corresponding roles for each user. Also, my users can be of different types and have different fields associated with them. ...
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46 views

Problem with the db design occurred when deleting a record and its reference records

I have an application with the following tables inside it. Categories - CategoryID, CategoryName, CategoryTypeID, IsActive CategoryTypes - CategoryTypeID, CategoryTypeName, IsActive Items - ItemID, ...
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1answer
68 views

Complicated data

I have a requirement i got from my father. He gave me a table and wanted me to digitalis it. So that he can the system can do all the dirty jobs for him ( that's why there are developers in the world, ...
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2answers
81 views

Disable all constraints and table checks while restoring a dump

I've obtained a dump of my PostgreSQL database with: pg_dump -U user-name -d db-name -f dumpfile which I then proceed to restore in another database with: psql X -U postgres -d db-name-b -f ...
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40 views

Need Help in DFD Diagram for online hotel booking system

Hi friends, I am creating a data flow diagram for online hostel booking system. not sure if i created a correct diagram or not any help would be appreciated. thanks in advance
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1answer
36 views

Best way to design a database with one person with different roles

We've been browsing for a while looking for an answer to this, but any of them suited exactly my needs, I hope is a relevant question. We have a database for managing books. In this database, a same ...
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3answers
59 views

Best approach for Legal/Natural can have many Orders

I'm working on this model: where as you may see one NaturalPerson can have many Order and the same for LegalPerson the only difference between NaturalPerson and LegalPerson are a few so in that ...
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1answer
52 views

Calculating a running balance to store with transactions

I need to put a read-only copy of balance and transaction data from a legacy system, which will only be used to view/print statements. Balance | id | member_id | product_id | balance | | 1 | ...
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2answers
165 views

Online Hostel Management System ER Diagram

I have created an ER diagram for an online hostel management system. Please advise me if this diagram makes sense or needs improvement.
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2answers
83 views

How to architect an analytical BI platform? [closed]

I am working on a new BI project for a medium sized corporation. Right now there is no Analytical infrastructure in place and the reporting is done manually in Excel. There are a few different data ...
5
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1answer
87 views

Many-to-many relationship with attributes

I'm working on a project where I need a book database. The problem is as follows: A book can be related to multiple people (authors, editors, traslators, etc.). Then a person may contribute to ...
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2answers
40 views

How to store user's language knowledge (150+ languages) in mysql DB

Users in my website must be able to select languages they know (English, German, etc), so I have a table languages with 150 languages (id, name) and table users (id and a lot of other fields). ...
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3answers
56 views

Removing chat history for a particular user from database

I'm currently developing a web chat application using SignleR and SQL server this is my database schema so far I've added an option where the user can Clear Chat history for a particular ...
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0answers
48 views

Oracle 11 table design for better performance for reports?

We have a requirement to design a report page. A few factors we have are: number of fields in report is 70 computed fields is going to around 14*8 (based on toggles) a filter is going to have ...
2
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3answers
105 views

Tracking events in a task database

In designing a task database with the usual set of tables (Users, Tasks etc), I'm wondering if there is an accepted way to track changes to fields in the task table? I could just provide a text log ...
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1answer
37 views

Should I drop this column or is there a query that can achieve a results table without duplicate columns?

I use a column named active in several of my database tables to adjust whether a particular entry/row/user/etc should be included in future query result tables instead of deleting the information. ...
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1answer
25 views

Separation of users columns in another table

I've got a quite a lot of columns on the users table and I have been cleaning it up recently. Now since I'm searching over the users I figured it would improve performance if I separated verification ...
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13 views

How to model mappings at various levels

I'm trying to design the database model for my application and I'm finding it difficult to design the mappings for user access to various entities stored in the database. If access was only ...
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33 views

Storing DB credentials in an application source code?

I am making an app which connects to a DB, and the app will have plenty different userslogins. Is it a good design choice to have a specific DB login/password for the application, using which the ...