The logical model and/or physical design of a database.

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Keep total transaction in invoice application

I want to make an application called as Invoice Application with MySQL database. Now I have designed this database. Now I want to know is this database good for Invoice Application. I will use MySQL ...
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1answer
167 views

What MySQL storage engine and table schema should I use?

I am making a web project and I created necessary and the most important table, but I am not sure that I did it right. In this site users will post data like text, picture, text's category, etc. I ...
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72 views

How to design this kind of relations in a database

I have a conceptual problem and I would like to get your ideas on how I'll be able to do what I am aiming. My goal is to create a database with information of persons who work at a place depending on ...
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1answer
111 views

Is it acceptable to have a surrogate/primary key of one table be the primary/foreign key of another table?

For my purposes I'm trying to apply this to Microsoft SQL, but would like to know if there are restrictions for other DBMS regarding this. I don't know how to represent UML as ascii characters so if ...
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1answer
70 views

Several variants of a string in tables

I need: a table containing keyword phrases; a table containing URLs; a table (or maybe a view) with keyword-URL pairs (referring to IDs of the two previous tables); tables holding keywords/URLs for ...
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1answer
125 views

unenforced constraints/possible duplication in my database design?

I am trying to store information about a school and the class timetable in a database. The outline is as follows: 'A subject has ~20 lessons, each of which needs to have it's description stored in ...
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1answer
340 views

Users database to store access levels, can I move the non-essential information to another table?

I would like some advice on the best database structure for my system. I have different kinds of users with different access levels, and different information of course. I created a users table with ...
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1answer
256 views

Trouble in Multi-Language DB

I'm working on a DB design for medicines in many countries with different languages. I created a table for the different languages I want and link it to another table of chemicals. But I find that ...
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2k views

Db design for a quiz with variable number of answer choices, and each worth different score in a different category?

I'm working on a question/answer project and having a hard time coming up with a suitable database structure. Each question can have from 1 - "n" answers, and each answer is associated with one of ...
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1answer
260 views

How to simplify schema for multi database / hundreds of millions of rows data set

We currently have a MySQL data set that was started about 10 years ago that aggregates a log of data, and accumulates millions of rows each month. The people that developed our system started ...
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2answers
104 views

Tiered permissions to generate conditional data access

I am working to improve the confidentiality and access level of the information presented within a program interface over top of a MySQL database. My goal is to create a two tier system: one based on ...
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152 views

Review my logical model for gaps

We need to centralize our ability to manage the various schedules that our banking centers keep since it is a manual nightmare right now. Do you see any obvious gaps in this? A schedule is ...
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5k views

How can primary keys in a Netezza table be indexed?

What is the best way to index a Netezza fact table with lots of primary keys. For now, let's suppose we have 10 primary keys. This table is mainly used to store meta data about our database. ...
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1answer
448 views

SQL DB design to support user feeds (in application like facebook)

I have a social network server with a MySql DB. I want to show the users feeds like done in Facebook. Example - UserX now Friend with userY, userX did like on postX etc. Currently I have table: C1 : ...
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1answer
575 views

Data base structure of a subscriber list

I am building a application that allow different user to store the subscriber information To store the subscriber information , the user first create a list For each list, there is a ListID. ...
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2answers
256 views

How to implement Draft functionality, with attached files?

Should allow for: User can save an entity as a draft, that would normally not be valid in its table (ie some missing values) User can attach files to the draft User can find, sort, and discard their ...
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1answer
139 views

Help me to better design my query so I can gain more performance

I need to find so called first entry in database for items regarding their partners. I wrote query and it is giving me correct results but it sucks with performances. I suspect that I have missed ...
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2answers
86 views

Advice on choosing a primary key

I will have to do this process in EXCEL first before it is made into a database. I will have many files, but there is about 7 - 9 files that work all together as one e.g. X192AD1-test.docx ...
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119 views

database normalization and optimization for postOffice DB

I am designing a web application for a post office. Performance in database is critical for them. I have designed the below structure for the post database, is there any flaw in my db structure which ...
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1answer
479 views

Depicting permissions to access table via E -R diagram

I am designing a database schema for a web application. Its a first time I am designing a database with a commercial aim. I have started with drawing E-R diagrams after going through requirements ...
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1answer
1k views

Database design for head to head sports

I am trying to create a database to store details relating to darts matches. Im relatively new to this so was wondering if the design I've come up with below would work. It seems I have lots of places ...
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1answer
24 views

First time database creation, for college [on hold]

So I have restructured my question based on new knowledge. So first thing first. I basically a student worker for a college department for career success, which is brand new and starting from ...
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2answers
38 views

Database Design - Voting System

I'm creating a website in which people can submit there own lists, and then essentially others Up/Down Vote the items within the list. I'd like the list (If the submitter allows "votes") to be ordered ...
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12 views

Relationship between data independence and database schema

What is the relationship between data independence and database schema? I know both of them separately. But I don't know how to explain the relationship of these two.
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18 views

Design - duplicating properties vs not allowing delete

I'm designing a database for a mobile app CMS that contains user data. These objects are Address and Job (a job can have 1 address and an address can have many jobs). The first version of a similar ...
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11 views

Question on comparing two fields in Access

I'm not sure if the title is fitting as I am not 100% sure if what I am doing is correct but here goes. Here is my enrolment table, I have added a field called pass/fail as you can see which is ...
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How can I make microsoft Access update fields that are linked in several tables?

I am working on a database for clinical observations in cancer mouse models. Usually, the animal care staff reports an observation that the vet checks. Sometimes, we have false positives that I need ...
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30 views

Can this be further normalized?

I have to define a system where we will be storing Image data and which can have an arbitrary number of attributes for the Image added per client. I have designed the following table Image ImageID ...
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How to properly implement a relationship between a table with an array of foreign keys and the foreign table? [duplicate]

I'm not entirely sure how to implement this kind of relationship correctly. As an example, assume that we have: CREATE TABLE menu_item ( mi_name TEXT PRIMARY KEY, mi_ingredients TEXT[] ); ...
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27 views

how to desing a database for loan management in mysql [on hold]

I am not very well experienced in database design . I designed database tables for user and account information `but in case of designing table for loan management and fixed deposits.` I want to ...
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33 views

Are my two proposed solutions on modelling resources inventory decent?

In the project management system that I am developing, I am wondering what is the best database design for keeping track of the resources inventory. While I want to determine what resources are ...
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1answer
43 views

Store massive values data from remote controllers

I implemented telemetry system in order to observe state of remote objects. Every object has a controller collecting data from some sensors (about 10-30 controlled parameters, lets take average value ...
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1answer
25 views

Every “INSERT” query check a combination of column's records

Unfortunately, my mind has stacked right now and i would like to design a really simple DB schema. What i want? In a simple table, for instance Table1, there are two different columns, Series and ...
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29 views

Sql multiple table checks for polling

I am implementing long polling using mysql for a near realtime data update for clients. Currently, this is what I have (and it works): A messages table, that holds messages between users,there is a ...
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39 views

Why do I need this attribute?

This is my relational schema; Book(title, shelfmark, ISBN, author, year) Genre(name) GenreBook(name, ISBN) User(firstName, lastName, cardID) UserBooks(cardID, ISBN, position) Why do I need the ...
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21 views

Schema Design for multiple many-to-one relationships. of which exactly one should exist

Say I have table A, B, and C. B and C can both be related to multiple A's, but each A should have exactly one of either B or C related to it. Which database design is better: A: a_id, b_id NULL, ...
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16 views

Sum data from 3 tables(joining), but one of may no data then other tables data will show

I am making a stock group summary report for this I am making Sum data from 3 joining tables, but one of may no data then other tables data will show. I have 3 tables as: ac_stock_item, ...
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27 views

Is this solution correct?

We have the final relations of a database: Worker ( ID_W, Name_Lastname,Obligations, #ID_D) Department ( ID_D, Name_D) Vacation ( #ID_W, #BeginningDate ,Length_days) I have to draw the Conceptual ...
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30 views

Is double one to many a bad design? It looks duplicate when joining both one-to-many tables

Suppose I have user table, book table, DVD table. User can borrow n book, n DVD at the same time, a book or a DVD can be borrowed by a user. (I understand it is many-to-many situation in real life, ...
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19 views

Remove a parent entity in PowerDesigner

I have User table in a PowerDesigner logical model, which inherits from a base entity that has Id as int. I need to change this to string. I can't change the base entity's id type, as only one table ...
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12 views

Table mapping _ updating

I have three tables with inserted data so I want to update Value.Value with H.facility and H.Dep and H.CAT. Actually table V is the metadata of table H and table value has FK to V. I want to ...
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28 views

DB table structure for many-to-many relationship

I'm trying to develop a relational DB design which stores data related to aerial survey(s) conducted off of the coast. The DB stores the actual data collected, as well as design parameters. The ...
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1answer
40 views

sqlite database table with 1000's of columns

I am using sqlite3 in an application to conduct an alalysis of distances between sets of points. Distances between these points have been precomputed using dijkstra's algorithim and left me with a ...
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0answers
32 views

Relationship between favorite and contact in database

I am making an E-R diagram for my contact project that simply has contact and favorite as tables. Both of them has the same attributes(ex:id,name,number). What is the relationship between such ...
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1answer
38 views

Query other database's INFORMATION_SCHEMA tables

I have a shared database that stores procedures for all the other databases on the same server. This helps maintain one instance of a procedure rather than copying it across all databases. As long as ...
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1answer
35 views

Joining 4 tables of which one is unrelated

I have 4 tables as follows. I want to find a wholesum resultset, limited to 25 records, in the following way: Users from Table1 based on a condition And those Users should not be in Table2 [Non ...
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43 views

Updated Financial Database Design

I took the design that @Daniel Hutmacher suggested in question below: Financial database design I amended it as to what I need below: -- Companies CREATE TABLE companies_list ( [code] int NOT ...
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2answers
54 views

Document Store & Relational DB Hybrid. Exists? Possible?

Does anyone know of any product or open source project that attempts to strap together Mongo DB and MySQL for instance? I hear a lot about how relational DBs being ACID compliant makes it nearly ...
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1answer
38 views

Best to isolate the database in multiple instances?

I read on a forum about the use of database isolated environments are neccessary for any large project that handles "big" data. For instance I will be using the following table for ALL blogs: ...
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26 views

DB table design for attributes with multiple entries (eg: Person -> Social Media)

I am trying to decide the structure of a DB table to store Employee data. I am bit confused on how to design attributes such as Address, Social Media etc. There should be provision for multiple Social ...