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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4answers
232 views

Can't finish my ER diagram

I am trying to create a database for a small book library. This is not a professional project, just an exercise of my own. This is my first time to try this ( I am self-taught ) and I am encountering ...
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3answers
100 views

Study material for Advanced Databases module inc SQL, Relational Model, ERM & TM [closed]

For my next module in my masters, I am planning on studying Advanced Databases. (Long story short, the masters is designed for people with NON-CS degrees, so I have never studied databases, therefore ...
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1answer
47 views

Oracle Concurrent Insertion

We have simple case like Create table t1 (c1 number primary); session1: insert into t1 values (1); //session1 do not commit transaction session2: insert into t1 values (2); Will Session2 ...
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1answer
148 views

A question regarding the performance of normalization

I am sorry this is such a newb question, but it is one thing I am having a difficult time wrapping my mind around, and after an evening spent reading I finally just decided to ask for some ...
0
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1answer
28 views

Ensuring that 1 row has 5 specific records referencing it

Context: a TEST has many CASEs. Typical. However, the catch is that a TEST instance must have exactly 5 instances of CASE (1 to 5). I could do something like this: create table TEST ( ID ...
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2answers
48 views

Multidimensional aggregates

Suppose one wanted to cache simple aggregate data over a table or grouped parts of a table, one could simply make a table with the aggregated results. If the original table is only appended to, it is ...
0
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1answer
50 views

Should there be a temporary table to hold Order and OrderItems? [closed]

After trying out a few open-source restaurant POS, I still couldn't decide if there should be a temporary to hold Orders and OrderItems? I was initially thinking to have temporary tables and ...
1
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1answer
60 views

How to design tables such that a person can work for many companies? [closed]

Database design such that a person can work for many companies?
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2answers
877 views

Best practice design when expecting large data in a table

I have come across a way that kind of works for me, and was just wondering if it would have any side effects, or, if I'm just thinking about this the wrong way. I first had this idea when I was ...
1
vote
1answer
217 views

Saas MySQL Multiple Databases or One Database [closed]

I am using MYSQL so Database is the Schema, sorry if not using right terminology. I currently have a Saas product which has multiple databases one for each client with a main databases which we ...
0
votes
1answer
33 views

Does the creation of constraints affect the views that have been created earlier?

Does the creation of constraints(foreign key) affect the views that we have created earlier? create view allreservations (fno, customer) as SELECT f.flight_number, customer_number FROM flight f, ...
1
vote
1answer
88 views

Question about the workflow/design process/tools used by professional database designers

I hope this in the right place, as it's really more a question about database design software than the philosophy and practise of database administration. I'm a masters student doing an "introduction ...
1
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2answers
216 views

about giving same column name in every table of database

I have a database with 5 tables. In every table there is a column for checking status. If i give the name to that column which is same in all the 5 tables; What will happen? Is it correct according ...
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0answers
30 views

Database & Structure for SaaS reporting software

I'm building a SaaS application to allow users to upload data and perform reporting and analytics on it. The reporting and analytics would be quite simple like grouping and aggregating. This has ...
0
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0answers
362 views

How to select column names that contains specific value from other table's column

Suppose I have table items and logs. Both tables have col1, col2, col3, col4... col(n). col1.. col(n) in table items simply specifies key name (col1 = "beef", col2 = "chicken", col3 = "bacon") ...
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2answers
55 views

Suggestion for Tooth Chart Data Structure

Hello I'm not sure if this is an OK question here but here goes, I'm quite confused on how am I going to make the data structure of my tooth chart database. I had first this thought of making a data ...
0
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1answer
47 views

Postgres table contains 1 column, and that column is PK. How to insert new record?

In my application, I have an abstract base class, and 2 derived classes. The number of derived classed will probably not increase. If it does, it won't be more than a few. The class structure looks ...
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3answers
201 views

Working NoSQL scheme for a betting app

I'm building an app where a user can bet on the result of a sports game. Basically, we feed the database with competitions and games, and the users can place their bet in the form of a score ...
0
votes
1answer
150 views

ERD Design for Employee Leave

I found the following ERD design: Which trying to capture as much information about employee leave (i.e sick, travel, etc). What am trying to understand is what does the columns: Table : ...
1
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1answer
23 views

Schema Design Inquiry

In a timesheets data model, suppose I have an employee table, and a job table. Then, I also have an employeeInJob table to store an employee's rate for a given job e.g. employeeInJob ( ...
1
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1answer
186 views

Help in designing mysql table for large project [closed]

I am planning to create a website which allows different Companies to register in it. It will have Employees module. Each company will have a CompanyId. How do I maintain the Employees table, since in ...
0
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0answers
28 views

Two types of rows with mutual fields and unique fields

I have a question about DB design. (MySQL) In my website, users can leave reviews for Stores and Products. Right now, there's a table for stores and a table for products. Each item ('item' = either ...
0
votes
2answers
132 views

Design a Lab Report tables [closed]

I need to design tables for a laboratory test. I will have Lab test name, and its component to be saved. The component can be changed with time. I need to design a UI for update. Also each ...
0
votes
1answer
170 views

How do I organize tables for simple lottery game? mysql [closed]

I am building a simple lottery web game that will let users pick a number that is in between that weeks given range. A number will be randomly select to determine the winner. I have a table for users ...
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2answers
143 views

How to configure Standby database in oracle for read/write

I have configured a physical standby database in Oracle 11gR2, and the standby database it's working fine. All the changes in the principal database are replicating to the standby database, the ...
1
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1answer
46 views

Database setup for datalogging

We're currently starting to build a version 2 of our system and one of the things we've noticed with version 1 is that we'll have quite a bit of data so we started to rethink our approach to how to ...
1
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1answer
93 views

Tables names in a supertype/subtype schema

I have 3 types of users in my app. The users share some common attributes, but they also have quite a bit of stuff that pertains uniquely to each user type. I have a person table that contains limited ...
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0answers
33 views

Merge colums from two different databases using phpMyAdmin

Is there a way to: Replace all the data from database1 > table1 > column2 With Data from Database2 > table1 > column2 ONLY under the condition that the ID value in database1 > table1 > column1 ...
3
votes
1answer
273 views

CouchDB and document versioning

I'm currently working on a wiki-esque application using CouchDB and am trying to implement a document versioning scheme. The way I see it there are two ways of doing this: Store each version as a ...
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0answers
309 views

How to represent directed graph with multiple parents?

http://dirtsimple.org/2010/11/simplest-way-to-do-tree-based-queries.html provides an algorithm for inserting and deleting from a Closure Table. I'd like to model a similar data structure, except that ...
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2answers
86 views

Unique column values between tables

I'm keeping track of teams and their members. Each team has one leader, one contact person, and any number of players, and each of them has a unique email address. The problem is that one physical ...
3
votes
2answers
55 views

I have this two models, which one is better?

what is a better design?? Model 1: +------+ +--------+ | type |-|--+ | Data | +------+ | +--------+ | id | | | Mach ID| | type | | | Time | | len | ...
0
votes
1answer
32 views

Is it possible to create this type of database for a massive forum? [closed]

Kind of like how craigslist you select a state, then a city, and you're in that community. How do I make my forum website's home page have 2 drop menus for a state and city, then it would bring the ...
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0answers
21 views

Handle a Search on 2 Big Tables

Hello i want to realize a exchange system with 2 tables. 1 Table for "the user is looking for" 1 Table for "the user has to share" the Tables are very simple id bigint user_id bigint object_id ...
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1answer
2k views

Database design for an online babyShop ,Toy shop

Hi i'm designing a database for a toy shop this shop offer many products with different categories. boystoys,girlstoys,puzzles,beds,stroller, etc i designed my database as it is consists of 5 tables ...
2
votes
1answer
93 views

Supertyping Inventory Transactions

I am trying to wrap all interactions with inventory items into one transactional table. Currently I calculate QoH by querying multiple fact tables (production, acquisition, shipment, return order, and ...
0
votes
1answer
587 views

Database design : hotel room and its detail

Right now i'm creating DB schema for a hotel. I stumbled upon on my hotel rooms table design. The requirement of hotel rooms would have data like : columns like room_type, room_size, room_number. ...
0
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0answers
42 views

Does storing page views in my page table slow performance?

I am storing page views in a view_countcolumn on my page table. So every time the page gets loaded I increment the view count and update the entry. What affect can this have on the performance of my ...
0
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2answers
351 views

Database design: same products in inventory but with different cost

I am trying to design a database for a Stock and Sale System and I have the following issue. Suppose there is an item in stock that costs $ 100 (product cost, not the selling price), but there are ...
0
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0answers
8 views

CROSS JOIN and updatable model design for Ruby on Rails [duplicate]

I am trying to build the multi-level model in rub on rails to allow the following to happen: When a user creates a campaign they will select some categories and some metros from tables Category and ...
0
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0answers
67 views

Multi-Tiered Database Design Issue

I am trying to build the multi-level model as demonstrated. When a user creates a campaign they will select some categories and some metros from tables Category and Metro. Those selections will then ...
1
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1answer
34 views

different log file for master and beta mysql

Hi i am facing a problem while shipping my database log I have three database server dev, beta and master and i maintain log files for dev on github and every log file has a version given to it like ...
0
votes
1answer
17 views

updatable entities in the design of databases

I have a question on Entity Relationship design. It is a shop where products are kept in stock first and then go to the store. When the store has less than a certain amount of product, products that ...
0
votes
1answer
491 views

Schema for a reservation system

I'm working on a reservation system schema and have some problems defining availability of resources. I searched for similar question here and on Google but still don't have clear understanding My ...
0
votes
2answers
76 views

Best Way to Migrate 100 tables To New Database

I need to migrate 100 out of 150 tables (data and structure) and everything else (sprocs, views etc.) to a new empty SQL Server database. I have been using the Import/Export wizard and it has been ...
2
votes
1answer
97 views

Optimized table design

I am building an advertisements system for websites ( a plugin for a framework ). I am not quite sure how I should set up the table in terms of indexes. Basically there are two options for billing - ...
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2answers
71 views

Architecting table with multiple paths to common parent tables

I'm wondering how to architect a database when there are multiple paths (via foreign keys) to a common parent table. For example I have the following tables: Table: Students PK StudentId Table: ...
0
votes
1answer
132 views

Cyclic relationships in ER Diagrams

I am trying to draw an generic entity-relationship diagram to model a software object (Let's say a xml file). This xml file has references to other xml files. Also if a xml file (say "file-A") is ...
-2
votes
1answer
141 views

Enterprise database design [closed]

we have customer who want to make some product like this or more specifically she needs replica of this product which is a generic inventory,product,customer etc management system. And the reqirement ...
7
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2answers
1k views

Is my understanding of Fact table granularity correct?

Myself and another DBA at our company are tasked with reviewing a database design that a vendor has developed for us. The vendor has said they use Kimball as the basis for their design. (NOTE: I am ...